/* ============================================================
   TOOL — QR-Crypt page styles
   ============================================================ */

/* ══════════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════════ */
.hero {
    position: relative;
    overflow: hidden;
    padding: 4rem 0 3.5rem;
    text-align: center;
    background: linear-gradient(180deg, rgba(232,247,251,.86) 0%, var(--color-bg) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(6,182,212,.10) 0%, transparent 55%);
    pointer-events: none;
}

@media (prefers-color-scheme: dark) {
    .hero::before {
        background: linear-gradient(135deg, rgba(6,182,212,.10) 0%, transparent 55%);
    }
}

.hero-inner {
    position: relative;
    max-width: 660px;
    margin-inline: auto;
}

/* Trust badge row */
.trust-row {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    justify-content: center;
    margin-bottom: 1.75rem;
}

.trust-pill {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .3rem .75rem;
    background: rgba(255,255,255,.82);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: .8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: .01em;
    white-space: nowrap;
}

.trust-pill svg { color: var(--color-primary); flex-shrink: 0; }

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1.1;
    margin-bottom: 1rem;
    color: var(--color-primary-darker);
}

@media (prefers-color-scheme: dark) {
    .hero h1 {
        color: var(--color-primary-darker);
    }
}

.hero-sub {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    max-width: 50ch;
    margin-inline: auto;
    line-height: 1.65;
}

/* Compact hero (inner pages) */
.hero-compact { padding: 2.25rem 0 2rem; }
.hero-compact::before { display: none; }
.hero-compact h1 { font-size: clamp(1.625rem, 4vw, 2.25rem); }

.hero-home {
    padding: 2rem 0 1.25rem;
}
.hero-home::before { display: none; }
.hero-home h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: .625rem;
}
.hero-home .hero-badge { margin-bottom: .875rem; }
.hero-home .hero-sub {
    max-width: 42ch;
    font-size: 1rem;
}

@media (max-width: 640px) {
    .hero-home {
        padding: 1.25rem 0 .75rem;
        text-align: left;
    }
    .hero-home .hero-inner { max-width: none; }
    .hero-home .hero-sub { margin-inline: 0; }
    .hero-home .hero-badge {
        justify-content: flex-start;
        font-size: .75rem;
    }
}

/* ══════════════════════════════════════════════════════════════
   TOOL CARD
   ══════════════════════════════════════════════════════════════ */
.tool-section {
    padding: 3rem 0 5rem;
    background: var(--color-bg);
}

.page-encrypt .tool-section {
    padding-top: 1rem;
}

@media (max-width: 640px) {
    .page-encrypt .tool-section {
        padding-top: .5rem;
    }
}

.tool-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    padding: 2rem;
    box-shadow: var(--shadow-card);
    max-width: 680px;
    margin-inline: auto;
}

@media (min-width: 640px) { .tool-card { padding: 2.5rem 3rem; } }

@media (prefers-color-scheme: dark) {
    .tool-card { box-shadow: var(--shadow-card); }
}

/* ── Form Steps ─────────────────────────────────────────────── */
.form-group {
    border: none;
    margin: 0 0 2rem;
    padding: 0;
}

.form-step {
    display: flex;
    align-items: center;
    gap: .625rem;
    font-size: .9375rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.875rem;
    height: 1.875rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: 10px;
    font-size: .8125rem;
    font-weight: 800;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(6,182,212,.35);
}

/* ── Form Fields ─────────────────────────────────────────────── */
.textarea-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: .4rem;
}

.char-counter {
    font-size: .8125rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    transition: color var(--transition);
}
.char-counter.warn  { color: var(--color-warning); }
.char-counter.error { color: var(--color-danger); font-weight: 700; }

/* ── Password row ───────────────────────────────────────────── */
.password-row {
    display: flex;
    gap: .5rem;
    align-items: stretch;
    flex-wrap: wrap;
    min-width: 0;
}

.password-wrapper {
    position: relative;
    flex: 1 1 220px;
}

.password-row > .btn {
    justify-content: center;
    flex: 1 1 auto;
}

.password-wrapper .form-input { padding-right: 2.75rem; }

.password-wrapper .btn-icon {
    position: absolute;
    right: .375rem;
    top: 50%;
    transform: translateY(-50%);
}

/* ── Strength Bar ───────────────────────────────────────────── */
.strength-wrapper {
    display: flex;
    align-items: center;
    gap: .75rem;
    margin-top: .625rem;
    min-height: 1.25rem;
}

.strength-track {
    flex: 1;
    height: 4px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    border-radius: 999px;
    width: 0;
    transition: width .4s cubic-bezier(.4,0,.2,1), background .4s ease;
}
.strength-bar[aria-valuenow="1"] { width: 25%; background: var(--color-danger); }
.strength-bar[aria-valuenow="2"] { width: 50%; background: var(--color-warning); }
.strength-bar[aria-valuenow="3"] { width: 75%; background: var(--color-primary); }
.strength-bar[aria-valuenow="4"] { width: 100%; background: var(--color-success); }

.strength-label {
    font-size: .8125rem;
    color: var(--color-text-muted);
    min-width: 6.5rem;
    text-align: right;
}

/* ── Format Chooser ─────────────────────────────────────────── */
.format-options {
    display: grid;
    gap: .75rem;
}

@media (min-width: 480px) { .format-options { grid-template-columns: 1fr 1fr; } }

.format-option { display: block; cursor: pointer; }

.format-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.format-card {
    display: block;
    padding: 1rem 1.125rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: #fff;
    transition: border-color .15s, background .15s, box-shadow .15s;
    user-select: none;
    height: 100%;
}

.format-option:hover .format-card {
    border-color: rgba(6,182,212,.40);
    background: #fff;
}

.format-option input:checked + .format-card {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
    box-shadow: 0 0 0 3px rgba(6,182,212,.12);
}

.format-option input:focus-visible + .format-card {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.format-title {
    display: flex;
    align-items: center;
    gap: .4rem;
    font-weight: 700;
    font-size: .9375rem;
    color: var(--color-text);
    margin-bottom: .3rem;
}

.format-desc {
    font-size: .8125rem;
    color: var(--color-text-muted);
    line-height: 1.45;
}

.advanced-options {
    margin: -.25rem 0 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: #fff;
}

.advanced-options summary {
    padding: .75rem 1rem;
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: .875rem;
    font-weight: 700;
    list-style-position: inside;
}

.advanced-options summary:hover {
    color: var(--color-text);
}

.advanced-options .format-options {
    padding: 0 1rem 1rem;
}

.badge {
    display: inline-block;
    padding: .1rem .5rem;
    background: var(--color-success);
    color: #fff;
    border-radius: 999px;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.badge--burn {
    background: var(--color-danger);
}

.format-option--burn input:checked + .format-card {
    border-color: var(--color-danger);
    background: var(--color-danger-light);
    box-shadow: 0 0 0 3px rgba(239,68,68,.12);
}

.format-option--burn:hover .format-card {
    border-color: rgba(239,68,68,.35);
}

/* ── Submit Button ──────────────────────────────────────────── */
.btn-primary.btn-submit {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    box-shadow: var(--shadow-primary);
    transition: box-shadow .2s, transform .1s, opacity .15s;
}
.btn-primary.btn-submit:hover:not(:disabled) {
    box-shadow: 0 8px 22px rgba(6,182,212,.32);
    transform: translateY(-1px);
}
.btn-primary.btn-submit:active:not(:disabled) { transform: translateY(0); }

/* ══════════════════════════════════════════════════════════════
   RESULT SECTION
   ══════════════════════════════════════════════════════════════ */
.result-section[hidden] { display: none; }
.result-section {
    animation: fadeSlideUp .35s ease both;
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.result-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2.25rem 0;
    color: var(--color-text-muted);
    font-size: .8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
}
.result-divider::before,
.result-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.result-title {
    text-align: center;
    font-size: 1.25rem;
    margin-bottom: 1.75rem;
    color: var(--color-text);
}

/* QR display */
.qr-display {
    display: flex;
    justify-content: center;
    margin-bottom: 1.75rem;
}

.qr-frame {
    position: relative;
    padding: 16px;
    background: #fff;
    border-radius: 16px;
    box-shadow:
        0 0 0 1px rgba(0,0,0,.06),
        0 4px 24px rgba(6,182,212,.12),
        0 1px 4px rgba(0,0,0,.06);
}

.qr-frame canvas { display: block; border-radius: 4px; }

/* Lock icon overlay on QR */
.qr-badge {
    position: absolute;
    bottom: -10px;
    right: -10px;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--color-bg-card);
    box-shadow: 0 2px 6px rgba(6,182,212,.4);
}

.qr-badge svg { color: #fff; }

/* Download grid */
.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .625rem;
    margin-bottom: .75rem;
}

.download-grid .btn { justify-content: center; }

.result-secondary-actions {
    display: flex;
    gap: .5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.result-actions {
    display: grid;
    gap: .625rem;
    margin-bottom: .75rem;
}

.result-actions .btn {
    justify-content: center;
    min-height: 44px;
    white-space: normal;
}

@media (min-width: 560px) {
    .result-actions {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1080px) {
    .result-actions {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

/* Security hint */
.security-hint {
    display: flex;
    gap: .75rem;
    align-items: flex-start;
    padding: 1rem 1.125rem;
    background: linear-gradient(135deg, rgba(217,119,6,.08) 0%, rgba(217,119,6,.04) 100%);
    border: 1px solid rgba(217,119,6,.3);
    border-left: 3px solid var(--color-warning);
    border-radius: 10px;
    font-size: .875rem;
    line-height: 1.5;
    color: var(--color-text);
}
.security-hint svg { flex-shrink: 0; margin-top: 1px; color: var(--color-warning); }

/* ══════════════════════════════════════════════════════════════
   DECRYPT — Tabs
   ══════════════════════════════════════════════════════════════ */
.input-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
    margin-bottom: 1.5rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 4px;
}

.tab {
    padding: .5rem .875rem;
    background: transparent;
    border: none;
    border-radius: 9px;
    font-size: .875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: background .15s, color .15s, box-shadow .15s;
    white-space: nowrap;
    text-align: center;
}

@media (min-width: 640px) {
    .input-tabs {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.tab:hover { color: var(--color-text); }

.tab.is-active {
    background: rgba(6,182,212,.10);
    color: var(--color-primary);
    box-shadow: none;
}

.tab:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.tab-panel[hidden] { display: none; }

.mobile-camera-cta {
    display: flex;
    margin-bottom: .875rem;
}

@media (min-width: 640px) {
    .mobile-camera-cta { display: none; }
}

/* Auto status */
.auto-status {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-text-muted);
}
.auto-status-icon { margin-bottom: .875rem; opacity: .35; }
.auto-status-icon svg { margin-inline: auto; }

/* Upload zone */
.upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem 1.5rem 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s, background .2s;
    color: var(--color-text-muted);
    position: relative;
}
.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--color-primary);
    background: rgba(6,182,212,.08);
}
.upload-zone.is-processing {
    border-color: var(--color-primary);
    background: rgba(6,182,212,.08);
    cursor: wait;
}
.upload-zone svg { margin-inline: auto; margin-bottom: 1rem; opacity: .4; }
.upload-zone p   { font-size: .9375rem; line-height: 1.5; }
.upload-link { color: var(--color-primary); text-decoration: underline; font-weight: 600; }
.file-input-hidden { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }

.scan-status {
    min-height: 1.25rem;
    margin-top: .75rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: .875rem;
    line-height: 1.4;
}
.scan-status[data-state="success"] { color: var(--color-success); font-weight: 600; }
.scan-status[data-state="error"] { color: var(--color-danger); font-weight: 600; }

/* Camera scanner */
.camera-scanner {
    display: grid;
    gap: 1rem;
}

.camera-preview {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    min-height: 240px;
    background: var(--color-primary-darker);
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.camera-preview video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: var(--color-primary-darker);
}

.camera-preview .scan-region-highlight {
    z-index: 1;
}

.camera-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .625rem;
    justify-content: center;
}

@media (max-width: 480px) {
    .camera-preview { min-height: 210px; }
    .camera-actions .btn {
        flex: 1 1 100%;
        justify-content: center;
    }
}

/* Decrypt form */
.decrypt-form {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    animation: fadeSlideUp .25s ease both;
}

.cipher-preview {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .625rem 1rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin-bottom: 1.125rem;
    font-family: var(--font-mono);
    font-size: .8rem;
    overflow: hidden;
}
.cipher-prefix { color: var(--color-primary); font-weight: 700; font-size: .875rem; }
.cipher-dots   { color: var(--color-text-muted); letter-spacing: .15em; }
.cipher-length { color: var(--color-text-muted); margin-left: auto; flex-shrink: 0; font-size: .75rem; }

/* Decrypt result */
.result-box {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1.125rem;
    max-height: 280px;
    overflow-y: auto;
}

.plaintext-output {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
    font-size: .9375rem;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--color-text);
    line-height: 1.6;
}

/* Countdown */
.countdown-bar {
    position: relative;
    height: 3px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: visible;
    margin-bottom: .5rem;
}
.countdown-fill {
    position: absolute;
    left: 0; top: 0;
    height: 100%;
    background: var(--color-success);
    transition: width 1s linear, background 1s;
    border-radius: 999px;
    width: 100%;
}
.countdown-text {
    position: absolute;
    right: 0;
    top: -1.625rem;
    font-size: .75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}
.countdown-hint {
    font-size: .8125rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}

/* ══════════════════════════════════════════════════════════════
   HOW IT WORKS — Homepage
   ══════════════════════════════════════════════════════════════ */
/* Polished result and scanner surfaces */
.result-hero {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    background: linear-gradient(180deg, #fff, var(--color-surface-alt));
}

.result-kicker {
    margin: 0 0 .2rem;
    color: var(--color-primary-dark);
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.result-hero .result-title {
    margin: 0;
    text-align: left;
    font-size: 1.15rem;
}

.result-state-pill {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    flex: 0 0 auto;
    padding: .35rem .65rem;
    border-radius: 999px;
    background: var(--color-success-light);
    border: 1px solid var(--color-success-border);
    color: var(--color-success-dark);
    font-size: .75rem;
    font-weight: 800;
    white-space: nowrap;
}

.result-state-dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: var(--color-success);
}

.result-meta-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: .625rem;
    margin: 0 0 1rem;
}

@media (min-width: 560px) {
    .result-meta-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.result-meta-grid div {
    padding: .75rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.result-meta-grid dt {
    margin-bottom: .2rem;
    color: var(--color-text-muted);
    font-size: .7rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.result-meta-grid dd {
    margin: 0;
    color: var(--color-primary-darker);
    font-size: .9rem;
    font-weight: 800;
}

.security-hint--result {
    background: rgba(6,182,212,.06);
    border-color: rgba(6,182,212,.22);
    border-left-color: var(--color-primary);
}

.security-hint--result svg {
    color: var(--color-primary-dark);
}

.scanner-console {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    background: linear-gradient(180deg, #fff, var(--color-surface-alt));
}

.scanner-kicker {
    margin: 0 0 .15rem;
    color: var(--color-primary-dark);
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.scanner-console h2 {
    margin: 0;
    font-size: 1.05rem;
}

.scanner-console-pills {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: .4rem;
}

.scanner-console-pills span {
    padding: .3rem .55rem;
    border-radius: 999px;
    background: rgba(6,182,212,.08);
    border: 1px solid rgba(6,182,212,.18);
    color: var(--color-primary-dark);
    font-size: .72rem;
    font-weight: 800;
}

.tab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    min-height: 40px;
}

.tab-icon {
    flex: 0 0 auto;
}

.camera-preview {
    border-radius: 16px;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
}

.scan-frame {
    position: absolute;
    inset: 16%;
    z-index: 2;
    pointer-events: none;
}

.scan-frame span {
    position: absolute;
    width: 34px;
    height: 34px;
    border-color: #fff;
    opacity: .92;
}

.scan-frame span:nth-child(1) {
    top: 0;
    left: 0;
    border-top: 3px solid;
    border-left: 3px solid;
    border-radius: 10px 0 0 0;
}

.scan-frame span:nth-child(2) {
    top: 0;
    right: 0;
    border-top: 3px solid;
    border-right: 3px solid;
    border-radius: 0 10px 0 0;
}

.scan-frame span:nth-child(3) {
    bottom: 0;
    right: 0;
    border-bottom: 3px solid;
    border-right: 3px solid;
    border-radius: 0 0 10px 0;
}

.scan-frame span:nth-child(4) {
    bottom: 0;
    left: 0;
    border-bottom: 3px solid;
    border-left: 3px solid;
    border-radius: 0 0 0 10px;
}

.scan-frame-label {
    position: absolute;
    left: 50%;
    bottom: 1rem;
    z-index: 2;
    transform: translateX(-50%);
    padding: .35rem .65rem;
    border-radius: 999px;
    background: rgba(18,49,63,.78);
    color: #fff;
    font-size: .75rem;
    font-weight: 800;
    white-space: nowrap;
}

.camera-preview[data-state="success"] .scan-frame span {
    border-color: var(--color-success);
}

.camera-preview[data-state="error"] .scan-frame span {
    border-color: var(--color-danger);
}

.camera-preview[data-state="active"] .scan-frame {
    animation: scanPulse 1.8s ease-in-out infinite;
}

@keyframes scanPulse {
    0%, 100% { opacity: .86; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.02); }
}

@media (max-width: 640px) {
    .scanner-console {
        display: none;
    }

    .input-tabs {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        overflow: visible;
    }

    .tab {
        gap: .25rem;
        padding: .55rem .3rem;
        font-size: .75rem;
        white-space: nowrap;
    }

    .tab-icon {
        width: 14px;
        height: 14px;
    }

    .tab-primary-mobile {
        order: -1;
    }

    .mobile-camera-cta {
        min-height: 52px;
        margin-bottom: 1rem;
        font-size: 1rem;
    }

    .result-hero {
        display: grid;
    }

    .result-state-pill {
        justify-self: start;
    }
}

.explainer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: .5rem;
}
.section-sub {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
    font-size: .9375rem;
}

.steps-list {
    display: grid;
    gap: 1.5rem;
    list-style: none;
    padding: 0;
    max-width: 900px;
    margin-inline: auto;
    counter-reset: steps;
}

@media (min-width: 768px) {
    .steps-list {
        grid-template-columns: repeat(3, 1fr);
        position: relative;
    }

    /* Connecting arrow between steps */
    .steps-list::after {
        content: '';
        position: absolute;
        top: 36px;
        left: calc(33.333% + 12px);
        right: calc(33.333% + 12px);
        height: 2px;
        background: repeating-linear-gradient(
            90deg,
            var(--color-primary) 0,
            var(--color-primary) 6px,
            transparent 6px,
            transparent 12px
        );
        opacity: .3;
        pointer-events: none;
    }
}

.step-item {
    position: relative;
    text-align: center;
    padding: 2rem 1.5rem 1.75rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .2s, transform .2s;
}
.step-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.step-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary-soft) 0%, rgba(6,182,212,.08) 100%);
    color: var(--color-primary);
    border-radius: 16px;
    margin-bottom: 1.125rem;
    border: 1px solid rgba(6,182,212,.15);
}

.step-item h3 { margin-bottom: .375rem; font-size: 1.0625rem; }
.step-item p  { font-size: .9rem; color: var(--color-text-muted); margin: 0; line-height: 1.5; }

.explainer-link { text-align: center; margin-top: 2.5rem; font-size: .9375rem; }

/* ══════════════════════════════════════════════════════════════
   TRUST BAR — Homepage bottom
   ══════════════════════════════════════════════════════════════ */
.trust-bar {
    padding: 2.5rem 0;
    border-top: 1px solid var(--color-border);
}

.trust-grid {
    display: grid;
    gap: 1rem;
    text-align: center;
}

@media (min-width: 480px) { .trust-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .trust-grid { grid-template-columns: repeat(4, 1fr); } }

.trust-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    padding: 1.25rem 1rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.trust-item-icon {
    color: var(--color-primary);
    opacity: .85;
}

.trust-item-title {
    font-weight: 700;
    font-size: .9375rem;
    color: var(--color-text);
}

.trust-item-desc {
    font-size: .8125rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin: 0;
}

/* ══════════════════════════════════════════════════════════════
   ABOUT — Content Layout
   ══════════════════════════════════════════════════════════════ */
.content-layout {
    display: grid;
    gap: 2rem;
    padding-block: 2.5rem;
    align-items: start;
}

@media (min-width: 1024px) { .content-layout { grid-template-columns: 1fr 280px; } }

.content-main { min-width: 0; }
.content-main section { margin-bottom: 3rem; }
.content-main h2 { margin-bottom: .875rem; padding-bottom: .625rem; border-bottom: 2px solid var(--color-border); }
.content-main p  { max-width: 72ch; }

.crypto-diagram {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}
.crypto-diagram svg { min-width: 480px; }
.crypto-diagram figcaption { text-align: center; font-size: .8125rem; color: var(--color-text-muted); margin-top: .5rem; }

.usecase-grid {
    display: grid;
    gap: 1rem;
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}
@media (min-width: 640px) { .usecase-grid { grid-template-columns: 1fr 1fr; } }

.usecase-item {
    padding: 1.125rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}
.usecase-item h3 { font-size: .9375rem; margin-bottom: .25rem; }
.usecase-item p  { font-size: .875rem; color: var(--color-text-muted); margin: 0; }

.faq-list { display: flex; flex-direction: column; gap: .5rem; margin-top: .75rem; }
.faq-item { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.faq-question {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 1.125rem; font-weight: 600; font-size: .9375rem;
    cursor: pointer; list-style: none; user-select: none;
    transition: background var(--transition);
}
.faq-question:hover { background: var(--color-border); }
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after { content: "+"; color: var(--color-primary); font-size: 1.25rem; flex-shrink: 0; }
details[open] .faq-question::after { content: "–"; }
.faq-answer { padding: 0 1.125rem 1rem; font-size: .9375rem; color: var(--color-text-muted); border-top: 1px solid var(--color-border); }
.faq-answer p { margin-top: .75rem; }

.sidebar-card { background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.25rem; box-shadow: var(--shadow-sm); margin-bottom: 1rem; }
.sidebar-card h3 { font-size: 1rem; margin-bottom: .5rem; }
.sidebar-card p  { font-size: .9rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.sidebar-card-info { background: var(--color-bg-alt); }

.tech-list { list-style: none; padding: 0; margin: 0; font-size: .875rem; color: var(--color-text-muted); }
.tech-list li { padding: .3rem 0; border-bottom: 1px solid var(--color-border); display: flex; align-items: center; gap: .5rem; }
.tech-list li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); flex-shrink: 0; }
.tech-list li:last-child { border-bottom: none; }

/* Format specification page */
.format-layout {
    padding-top: 2rem;
}

.format-overview {
    padding: 1.25rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}

.format-code-block {
    margin: 1rem 0 0;
    background: #0f2530;
    border: 1px solid rgba(6,182,212,.25);
    color: #e6fbff;
    border-radius: 12px;
    white-space: pre;
    overflow-x: auto;
}

.format-code-block code {
    background: transparent;
    border: none;
    color: inherit;
    padding: 0;
}

.spec-kpi-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: .75rem;
}

@media (min-width: 640px) {
    .spec-kpi-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.spec-kpi-grid div {
    padding: .9rem 1rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.spec-kpi-grid span {
    display: block;
    color: var(--color-text-muted);
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.spec-kpi-grid strong {
    display: block;
    margin-top: .2rem;
    color: var(--color-primary-darker);
    font-size: .95rem;
}

.format-steps {
    display: grid;
    gap: .55rem;
    margin-top: 1rem;
    padding-left: 1.25rem;
}

.format-steps li {
    padding: .7rem .85rem;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: 10px;
}

.invariant-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: .875rem;
}

@media (min-width: 720px) {
    .invariant-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.invariant-grid article {
    padding: 1rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.invariant-grid h3 {
    margin-bottom: .35rem;
    font-size: .95rem;
}

.invariant-grid p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: .875rem;
}

/* Tables */
.table-wrapper { overflow-x: auto; }
.spec-table, .compare-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 1rem 0 1.5rem; }
.spec-table th, .compare-table th { background: var(--color-bg-alt); padding: .625rem .875rem; text-align: left; font-size: .8125rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); border-bottom: 1px solid var(--color-border); }
.spec-table td, .compare-table td { padding: .625rem .875rem; border-bottom: 1px solid var(--color-border); vertical-align: top; }
.spec-table tr:last-child td, .compare-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td, .compare-table tr:hover td { background: var(--color-bg-alt); }
.check-yes { color: var(--color-success); font-weight: 600; }
.check-no  { color: var(--color-danger);  font-weight: 600; }

/* Prose */
.prose { max-width: 72ch; margin: 2.5rem auto; }
.prose h2 { margin-top: 2.5rem; margin-bottom: .75rem; }
.prose h2:first-child { margin-top: 0; }
.prose ul, .prose ol { margin-bottom: 1rem; }
.prose li { margin-bottom: .375rem; }

/* ══════════════════════════════════════════════════════════════
   ERROR PAGES
   ══════════════════════════════════════════════════════════════ */
.error-code { font-size: clamp(4rem, 15vw, 8rem); font-weight: 900; line-height: 1; color: var(--color-border); margin-bottom: .5rem; }
.error-actions { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; margin-top: 1.5rem; }

/* ══════════════════════════════════════════════════════════════
   UTILS
   ══════════════════════════════════════════════════════════════ */
.mt-2 { margin-top: .5rem; }

/* ══════════════════════════════════════════════════════════════
   BURN-AFTER-READING
   ══════════════════════════════════════════════════════════════ */

/* ── Hero variants ───────────────────────────────────────────── */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .35rem .875rem;
    border-radius: 10px;
    font-size: .8125rem;
    font-weight: 600;
    letter-spacing: .01em;
    margin-bottom: 1.25rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.hero-badge--burn {
    background: rgba(220,38,38,.08);
    border-color: rgba(220,38,38,.25);
    color: #b91c1c;
}

@media (prefers-color-scheme: dark) {
    .hero-badge--burn {
        background: rgba(239,68,68,.12);
        border-color: rgba(239,68,68,.3);
        color: #fca5a5;
    }
}

.hero-burn::before {
    background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(220,38,38,.10) 0%, transparent 70%);
}

/* ── Burn options panel (encrypt page) ───────────────────────── */
.burn-options[hidden] { display: none; }

.burn-info-box {
    display: flex;
    gap: .75rem;
    align-items: flex-start;
    padding: .875rem 1rem;
    background: rgba(6,182,212,.06);
    border: 1px solid rgba(6,182,212,.20);
    border-left: 3px solid var(--color-primary);
    border-radius: 10px;
    font-size: .875rem;
    line-height: 1.55;
    margin-bottom: 1.25rem;
}
.burn-info-box svg { flex-shrink: 0; margin-top: 1px; color: var(--color-primary); }
.burn-info-box a { color: var(--color-primary); font-weight: 600; }

.burn-fields {
    display: grid;
    gap: .75rem;
    margin-bottom: 1rem;
}

@media (min-width: 520px) {
    .burn-fields { grid-template-columns: 1fr 1fr; }
    .burn-field-group--full { grid-column: 1 / -1; }
}

.burn-field-group {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: .875rem 1rem;
}

.burn-field-label {
    display: flex;
    align-items: center;
    gap: .4rem;
    font-weight: 700;
    font-size: .875rem;
    color: var(--color-text);
    margin-bottom: .25rem;
}
.burn-field-label svg { color: var(--color-text-muted); flex-shrink: 0; }

.burn-field-desc {
    font-size: .8rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin-bottom: .625rem;
}

.burn-select { width: 100%; }

.burn-summary {
    display: flex;
    gap: .625rem;
    align-items: flex-start;
    padding: .75rem 1rem;
    background: rgba(220,38,38,.05);
    border: 1px solid rgba(220,38,38,.2);
    border-radius: 10px;
    font-size: .875rem;
    line-height: 1.55;
    margin-bottom: 1.5rem;
}
.burn-summary svg { flex-shrink: 0; margin-top: 2px; color: #dc2626; }
.burn-summary p { margin: 0; }
.burn-summary strong { color: #dc2626; }

@media (prefers-color-scheme: dark) {
    .burn-summary { background: rgba(239,68,68,.08); border-color: rgba(239,68,68,.25); }
    .burn-summary svg, .burn-summary strong { color: #f87171; }
}

/* ── Burn result section ─────────────────────────────────────── */
.burn-result-header {
    display: flex;
    align-items: center;
    gap: .625rem;
    margin-bottom: 1.5rem;
}
.burn-icon { font-size: 1.5rem; }

.burn-result-meta {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: .625rem 1rem;
    font-size: .875rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.burn-delete-details {
    margin-top: 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}
.burn-delete-details summary {
    padding: .75rem 1rem;
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: .875rem;
    font-weight: 600;
    list-style-position: inside;
}
.burn-delete-details summary:hover { color: var(--color-text); }
.burn-delete-hint {
    padding: 0 1rem;
    font-size: .875rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: .75rem;
}
.burn-delete-btn {
    width: calc(100% - 2rem);
    margin: 0 1rem 1rem;
    color: var(--color-danger);
    border-color: var(--color-danger);
}
.burn-delete-btn:hover { background: rgba(220,38,38,.06); }

/* ── Burn view page (/b/{id}) ────────────────────────────────── */
.burn-view-card { max-width: 680px; }

.burn-gone { text-align: center; padding: 2.5rem 1rem; }
.burn-gone-icon { margin-bottom: 1.25rem; color: var(--color-text-muted); opacity: .5; }
.burn-gone-icon svg { margin-inline: auto; }
.burn-gone h2 { margin-bottom: .75rem; }
.burn-gone p  { color: var(--color-text-muted); margin-bottom: 1rem; }
.burn-gone-reasons {
    list-style: disc;
    text-align: left;
    display: inline-block;
    margin-bottom: 1.75rem;
    color: var(--color-text-muted);
    font-size: .9rem;
}
.burn-gone-reasons li { margin-bottom: .35rem; }

.burn-warning {
    display: flex;
    gap: .875rem;
    align-items: flex-start;
    padding: 1rem 1.125rem;
    background: rgba(245,158,11,.08);
    border: 1px solid rgba(245,158,11,.3);
    border-left: 3px solid var(--color-warning);
    border-radius: 10px;
    font-size: .9rem;
    line-height: 1.55;
    margin-bottom: 1.25rem;
}
.burn-warning-icon { flex-shrink: 0; margin-top: 1px; color: var(--color-warning); }

.burn-meta-list {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: .5rem 0;
    margin-bottom: 1.5rem;
}
.burn-meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .625rem 1.125rem;
    font-size: .9rem;
    border-bottom: 1px solid var(--color-border);
}
.burn-meta-row:last-child { border-bottom: none; }
.burn-meta-row dt { color: var(--color-text-muted); font-weight: 500; }
.burn-meta-row dd { font-weight: 700; }

.burn-actions { display: grid; gap: .625rem; margin-top: 1.5rem; }

.burn-reveal-btn {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    border: none;
    box-shadow: 0 4px 14px rgba(220,38,38,.35);
}
.burn-reveal-btn:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(220,38,38,.45);
    transform: translateY(-1px);
}

.burn-success-header {
    display: flex;
    align-items: center;
    gap: .625rem;
    font-weight: 700;
    font-size: 1.0625rem;
    color: var(--color-success);
    margin-bottom: 1.25rem;
}
.burn-success-icon { color: var(--color-success); }

.burn-destroyed-badge {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    padding: .2rem .625rem;
    background: rgba(220,38,38,.1);
    border: 1px solid rgba(220,38,38,.25);
    border-radius: 999px;
    font-size: .75rem;
    color: #b91c1c;
    font-weight: 600;
    margin-left: .5rem;
}
@media (prefers-color-scheme: dark) {
    .burn-destroyed-badge { background: rgba(239,68,68,.15); border-color: rgba(239,68,68,.3); color: #fca5a5; }
}

.burn-plaintext-wrapper {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    max-height: 320px;
    overflow-y: auto;
}
.burn-plaintext {
    font-size: .9375rem;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--color-text);
    line-height: 1.6;
    margin: 0;
    font-family: var(--font-mono);
}

.burn-countdown-bar {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .5rem .875rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: .8125rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}
.burn-countdown-bar svg { flex-shrink: 0; }
.mt-4 { margin-top: 1rem; }

/* ── Burn info article layout ───────────────────────────────── */
.about-section {
    background: #fff;
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 4rem;
}

.about-container {
    display: grid;
    gap: 2rem;
    align-items: start;
}

@media (min-width: 1024px) {
    .about-container {
        grid-template-columns: minmax(0, 1fr) 280px;
    }
}

.about-content {
    min-width: 0;
}

.about-content h2 {
    margin-top: 2.5rem;
    padding-bottom: .625rem;
    border-bottom: 2px solid var(--color-border);
}

.about-content h2:first-child {
    margin-top: 0;
}

.about-content h3 {
    margin-top: 1.5rem;
}

.about-content p,
.about-content li {
    color: var(--color-primary-light);
}

.about-content ul {
    margin-bottom: 1.25rem;
}

.about-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 1.25rem);
}

.comparison-table-wrapper,
.burn-sequence-diagram {
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin: 1.5rem 0 2rem;
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}

.comparison-table,
.comparison-table th,
.comparison-table td {
    border-collapse: collapse;
}

.comparison-table {
    width: 100%;
    min-width: 720px;
    font-size: .9rem;
}

.comparison-table th {
    background: #fff;
    color: var(--color-primary-darker);
    font-size: .8125rem;
    font-weight: 800;
    text-align: left;
    padding: .875rem 1rem;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table td {
    padding: .875rem 1rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover td {
    background: rgba(6,182,212,.05);
}

.check-partial {
    color: var(--color-warning);
    font-weight: 700;
}

.burn-sequence-diagram {
    padding: 1rem;
}

.burn-sequence-diagram svg {
    min-width: 760px;
}

.burn-sequence-diagram figcaption {
    color: var(--color-text-muted);
    font-size: .8125rem;
    text-align: center;
    margin-top: .75rem;
}