/* ==========================================================================
   Simplenote 中文站 · 共享样式
   品牌色：基于 Simplenote Logo 蓝（#3468B8）
   风格：扁平现代 / 浅色 / 无 emoji
   ========================================================================== */

:root {
    --primary: #3468B8;
    --primary-dark: #1F4E96;
    --primary-light: #EFF5FF;
    --primary-soft: #DCE8F8;

    --accent: #06B6D4;
    --success: #10B981;
    --warning: #F59E0B;
    --danger:  #EF4444;

    --ink-900: #0F172A;
    --ink-700: #1F2937;
    --ink-500: #475569;
    --ink-400: #64748B;
    --ink-300: #94A3B8;
    --ink-200: #CBD5E1;
    --ink-100: #E2E8F0;
    --ink-50:  #F1F5F9;
    --bg:      #FFFFFF;
    --bg-soft: #F8FAFC;

    --radius-sm: 6px;
    --radius:    10px;
    --radius-lg: 16px;
    --radius-xl: 22px;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
    --shadow:    0 4px 14px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);
    --shadow-lg: 0 14px 40px rgba(15, 23, 42, .08), 0 2px 6px rgba(15, 23, 42, .04);

    --container: 1200px;

    --ff-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Helvetica, Arial, sans-serif;
    --ff-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg-soft);
    color: var(--ink-700);
    font-family: var(--ff-sans);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4 {
    color: var(--ink-900);
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 .6em;
}
h1 { font-size: clamp(2rem, 4.2vw, 3.2rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; color: var(--ink-500); }

ul, ol { padding-left: 1.25em; color: var(--ink-500); }
li { margin-bottom: .35em; }
code, pre {
    font-family: var(--ff-mono);
    background: var(--ink-50);
    color: var(--ink-700);
    padding: .1em .4em;
    border-radius: 4px;
    font-size: .92em;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================== Header ============================== */
.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--ink-100);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(180%) blur(8px);
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--ink-900);
    font-size: 1.15rem;
}
.brand img{max-width: 50px;}
.brand .logo {
    width: 32px; height: 32px;
    background: var(--primary);
    border-radius: 50%;
    display: grid; place-items: center;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
}
.nav-menu {
    display: flex;
    gap: 8px;
    list-style: none;
    margin: 0; padding: 0;
}
.nav-menu a {
    display: inline-block;
    padding: 8px 14px;
    color: var(--ink-500);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all .2s;
}
.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    background: var(--primary-light);
}
.nav-cta {
    background: var(--primary);
    color: #fff !important;
    padding: 8px 18px;
    border-radius: var(--radius);
    font-weight: 600;
    transition: all .2s;
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }
.nav-toggle {
    display: none;
    background: none;
    border: 0;
    width: 40px; height: 40px;
    cursor: pointer;
}
.nav-toggle span {
    display: block;
    width: 22px; height: 2px;
    background: var(--ink-700);
    margin: 0 auto 5px;
    transition: .25s;
}

/* ============================== Hero ============================== */
.hero {
    padding: 80px 0 60px;
    background:
        radial-gradient(circle at 20% 10%, rgba(52,104,184,.08), transparent 50%),
        radial-gradient(circle at 80% 30%, rgba(6,182,212,.06), transparent 50%),
        linear-gradient(180deg, #fff, var(--bg-soft));
    overflow: hidden;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 60px;
    align-items: center;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}
.hero h1 {
    margin-bottom: 16px;
}
.hero p.lead {
    font-size: 1.15rem;
    color: var(--ink-500);
    margin-bottom: 32px;
    max-width: 540px;
}
.hero-actions {
    display: flex; gap: 12px; flex-wrap: wrap;
    margin-bottom: 28px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 15px;
    border: 0;
    cursor: pointer;
    transition: all .2s;
    text-decoration: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 6px 18px rgba(52,104,184,.35);
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 10px 26px rgba(31,78,150,.4);
}
.btn-ghost {
    background: transparent;
    color: var(--ink-700);
    border: 1px solid var(--ink-200);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

.hero-stats {
    display: flex; gap: 28px;
    color: var(--ink-400);
    font-size: 14px;
}
.hero-stats strong { color: var(--ink-900); font-size: 18px; display: block; }

.hero-mockup {
    position: relative;
    padding: 24px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--ink-100);
}
.mockup-bar {
    display: flex; gap: 6px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--ink-100);
}
.mockup-bar i {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--ink-200);
    display: inline-block;
}
.mockup-bar i:nth-child(1){ background:#FF5F57; }
.mockup-bar i:nth-child(2){ background:#FEBC2E; }
.mockup-bar i:nth-child(3){ background:#28C840; }

.app-shot {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 0;
    min-height: 320px;
}
.app-list {
    background: #fafbfc;
    border-right: 1px solid var(--ink-100);
    padding: 14px 10px;
    font-size: 12px;
}
.app-list h4 { margin: 6px 0 10px; font-size: 11px; color: var(--ink-400); text-transform: uppercase; letter-spacing: .06em; }
.note-pill {
    padding: 8px 10px;
    border-radius: 6px;
    color: var(--ink-500);
    margin-bottom: 4px;
    cursor: default;
}
.note-pill.active {
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 600;
}
.note-pill small { color: var(--ink-300); display: block; font-size: 11px; }
.app-content {
    padding: 28px 26px;
}
.app-content h3 { font-size: 1.6rem; margin-bottom: 10px; }
.tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    margin-right: 4px;
}
.cloud {
    margin: 16px 0;
    background: linear-gradient(135deg, #FBBF24, #F59E0B);
    height: 80px;
    border-radius: 8px;
    position: relative;
}
.cloud::before, .cloud::after {
    content: ''; position: absolute;
    background: #fff;
    border-radius: 50%;
}
.cloud::before { width: 30px; height: 30px; top: -10px; left: 30%; }
.cloud::after  { width: 50px; height: 50px; top: -20px; right: 25%; }

/* ============================== Section ============================== */
.section {
    padding: 80px 0;
}
.section-alt { background: var(--bg); }
.section-head {
    text-align: center;
    margin-bottom: 56px;
}
.section-head .eyebrow {
    display: inline-block;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.section-head h2 { margin-bottom: 14px; }
.section-head p { max-width: 640px; margin: 0 auto; font-size: 1.05rem; }

/* ============================== Features grid ============================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--bg);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all .3s;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-soft);
}
.feature-icon {
    width: 48px; height: 48px;
    display: grid; place-items: center;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius);
    margin-bottom: 18px;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.feature-card p { margin: 0; font-size: .95rem; }

/* ============================== Scenario ============================== */
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}
.scenario {
    text-align: center;
    padding: 28px 18px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--ink-100);
    transition: all .25s;
}
.scenario:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.scenario-icon {
    width: 56px; height: 56px;
    margin: 0 auto 14px;
    background: var(--primary-light);
    border-radius: 50%;
    display: grid; place-items: center;
    color: var(--primary);
}
.scenario-icon svg { width: 26px; height: 26px; }
.scenario h4 { font-size: 1rem; margin-bottom: 4px; color: var(--ink-900); }
.scenario p { font-size: 13px; margin: 0; }

/* ============================== Trust ============================== */
.trust-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid var(--ink-100);
    border-bottom: 1px solid var(--ink-100);
}
.trust-strip .stat strong {
    display: block;
    font-size: 2rem;
    color: var(--primary);
    font-weight: 800;
}
.trust-strip .stat span {
    color: var(--ink-500);
    font-size: 14px;
}

/* ============================== Quotes ============================== */
.quote-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.quote {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--ink-100);
}
.quote blockquote {
    margin: 0 0 12px;
    font-style: italic;
    color: var(--ink-700);
    line-height: 1.7;
}
.quote cite {
    color: var(--ink-400);
    font-size: 13px;
    font-style: normal;
}

/* ============================== FAQ ============================== */
.faq {
    max-width: 800px;
    margin: 0 auto;
}
.faq details {
    background: var(--bg);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius);
    padding: 18px 22px;
    margin-bottom: 10px;
    transition: .2s;
}
.faq details[open] {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}
.faq summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--ink-900);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: '';
    width: 12px; height: 12px;
    border-right: 2px solid var(--ink-400);
    border-bottom: 2px solid var(--ink-400);
    transform: rotate(45deg);
    transition: .25s;
}
.faq details[open] summary::after {
    transform: rotate(-135deg);
}
.faq .answer {
    margin-top: 14px;
    color: var(--ink-500);
    line-height: 1.8;
}

/* ============================== Footer ============================== */
.site-footer {
    background: var(--ink-900);
    color: var(--ink-300);
    padding: 60px 0 30px;
    margin-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-grid h5 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: .08em;
}
.footer-grid ul {
    list-style: none;
    padding: 0; margin: 0;
}
.footer-grid ul li { margin-bottom: 8px; }
.footer-grid a {
    color: var(--ink-300);
    font-size: 14px;
}
.footer-grid a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--ink-300);
    font-size: 13px;
}

/* ============================== Modal ============================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .55);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
    opacity: 0;
    transition: opacity .2s;
}
.modal-backdrop.open {
    display: flex;
    opacity: 1;
}
.modal {
    background: #fff;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 560px;
    padding: 36px;
    box-shadow: 0 24px 60px rgba(0,0,0,.25);
    position: relative;
    transform: translateY(20px);
    transition: transform .25s;
}
.modal-backdrop.open .modal {
    transform: translateY(0);
}
.modal-close {
    position: absolute;
    top: 16px; right: 18px;
    background: none;
    border: 0;
    font-size: 24px;
    color: var(--ink-400);
    cursor: pointer;
    width: 32px; height: 32px;
    border-radius: 50%;
    transition: .2s;
}
.modal-close:hover { background: var(--ink-50); color: var(--ink-900); }
.modal h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
    text-align: center;
}
.modal .sub {
    text-align: center;
    color: var(--ink-500);
    margin-bottom: 28px;
    font-size: 14px;
}
.qr-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}
.qr-card {
    text-align: center;
    background: var(--bg-soft);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius);
    padding: 16px 12px;
}
.qr-card .qr-frame {
    width: 140px; height: 140px;
    margin: 0 auto 10px;
    background: #fff;
    border: 1px solid var(--ink-100);
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: var(--ink-300);
    font-size: 12px;
}
.qr-card strong {
    display: block;
    color: var(--ink-900);
    font-size: 14px;
    margin-bottom: 2px;
}
.qr-card small { color: var(--ink-400); font-size: 12px; }
.modal-tip {
    text-align: center;
    color: var(--ink-400);
    font-size: 13px;
    margin: 0 0 16px;
}
.modal-direct {
    display: block;
    text-align: center;
    padding: 12px;
    border-radius: var(--radius);
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 600;
    font-size: 14px;
    border: 1px solid var(--primary-soft);
}
.modal-direct:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ============================== Platform tabs ============================== */
.platform-tabs {
    display: flex;
    gap: 6px;
    border-bottom: 1px solid var(--ink-100);
    margin-bottom: 28px;
    overflow-x: auto;
    scrollbar-width: none;
}
.platform-tabs::-webkit-scrollbar { display: none; }
.tab-btn {
    padding: 12px 22px;
    background: transparent;
    border: 0;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--ink-400);
    transition: .2s;
    white-space: nowrap;
    font-size: 15px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.tab-btn svg { width: 18px; height: 18px; }
.tab-btn:hover { color: var(--primary); }
.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.dl-card {
    background: var(--bg);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius-lg);
    padding: 36px;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 36px;
    align-items: center;
}
.dl-card h3 { margin-bottom: 6px; }
.dl-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 24px;
    margin: 18px 0;
    font-size: 14px;
}
.dl-meta div span { display: block; color: var(--ink-400); font-size: 12px; }
.dl-meta div strong { color: var(--ink-900); }
.dl-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

/* ============================== Page Hero small ============================== */
.page-hero {
    padding: 60px 0 40px;
    background: linear-gradient(180deg, #fff, var(--bg-soft));
    border-bottom: 1px solid var(--ink-100);
    text-align: center;
}
.page-hero h1 { font-size: 2.4rem; margin-bottom: 12px; }
.page-hero p { max-width: 660px; margin: 0 auto; font-size: 1.05rem; }
.breadcrumbs {
    color: var(--ink-400);
    font-size: 13px;
    margin-bottom: 12px;
}
.breadcrumbs a { color: var(--ink-500); }
.breadcrumbs a:hover { color: var(--primary); }

/* ============================== Feature detail ============================== */
.feat-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 80px;
}
.feat-row:nth-child(even) { direction: rtl; }
.feat-row:nth-child(even) > * { direction: ltr; }
.feat-visual {
    background: var(--bg);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
    min-height: 280px;
}
.feat-content h2 { font-size: 1.6rem; }
.feat-content ul {
    list-style: none;
    padding: 0;
}
.feat-content ul li {
    padding: 6px 0 6px 26px;
    position: relative;
}
.feat-content ul li::before {
    content: '';
    position: absolute;
    left: 0; top: 14px;
    width: 16px; height: 16px;
    background: var(--primary);
    border-radius: 50%;
    background-image:
        linear-gradient(45deg, transparent 38%, #fff 38% 50%, transparent 50% 60%, #fff 60% 72%, transparent 72%);
}
.feat-content ul li::after {
    content: '';
    position: absolute;
    left: 4px; top: 16px;
    width: 8px; height: 4px;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg);
}
.feat-content ul li > * { position: relative; z-index: 1; }

/* Markdown demo */
.md-demo { font-family: var(--ff-mono); font-size: 13px; line-height: 1.6; }
.md-demo .md-line { display: block; color: var(--ink-700); }
.md-demo .md-tag   { color: var(--primary); }
.md-demo h1.md-h { color: var(--ink-900); font-size: 1.3rem; font-weight: 700; }
.md-demo h2.md-h { color: var(--ink-900); font-size: 1.1rem; font-weight: 700; }

/* Sync animation */
.sync-demo {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 24px 0;
}
.sync-device {
    width: 90px; height: 120px;
    background: var(--bg-soft);
    border: 1px solid var(--ink-100);
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: var(--ink-400);
    position: relative;
}
.sync-device::after {
    content: '';
    width: 60%; height: 4px;
    background: var(--primary);
    border-radius: 4px;
    animation: pulse 1.4s infinite ease-in-out;
    opacity: .6;
}
@keyframes pulse {
    0%, 100% { transform: scaleX(.6); opacity: .4; }
    50% { transform: scaleX(1); opacity: 1; }
}

/* Version history bars */
.vh-list .vh-item {
    display: grid;
    grid-template-columns: 110px 1fr;
    padding: 10px 0;
    border-bottom: 1px dashed var(--ink-100);
    font-size: 13px;
}
.vh-list .vh-item small { color: var(--ink-400); }
.vh-list .vh-item .now {
    color: var(--primary);
    font-weight: 600;
}

/* Tag cloud */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud .tg { padding: 6px 14px; background: var(--primary-light); color: var(--primary-dark); border-radius: 999px; font-size: 13px; font-weight: 500; }

/* ============================== Guide ============================== */
.shortcut-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.shortcut-table th,
.shortcut-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--ink-100);
    font-size: 14px;
}
.shortcut-table th {
    background: var(--bg-soft);
    color: var(--ink-900);
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.shortcut-table kbd {
    display: inline-block;
    padding: 3px 8px;
    background: var(--bg-soft);
    border: 1px solid var(--ink-200);
    border-bottom-width: 2px;
    border-radius: 4px;
    font-family: var(--ff-mono);
    font-size: 12px;
    color: var(--ink-900);
    margin: 0 2px;
}
.shortcut-table tr:last-child td { border-bottom: 0; }

.step-list {
    counter-reset: step;
    list-style: none;
    padding: 0;
    display: grid;
    gap: 18px;
}
.step-list li {
    counter-increment: step;
    background: var(--bg);
    padding: 22px 22px 22px 78px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--ink-100);
    position: relative;
    color: var(--ink-500);
}
.step-list li::before {
    content: counter(step);
    position: absolute;
    left: 22px; top: 22px;
    width: 38px; height: 38px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: grid; place-items: center;
    font-weight: 700;
    font-size: 16px;
}
.step-list li strong { color: var(--ink-900); display: block; margin-bottom: 4px; font-size: 1rem; }

/* ============================== About ============================== */
.about-card {
    background: var(--bg);
    border: 1px solid var(--ink-100);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 24px;
}
.about-card h2 { margin-bottom: 14px; }
.about-card p { margin: 0 0 10px; }

.prose h2, .prose h3 { color: var(--ink-900); }
.prose p, .prose li { color: var(--ink-500); }

/* ============================== Responsive ============================== */
@media (max-width: 960px) {
    .hero { padding: 60px 0 40px; }
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-strip { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .quote-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .feat-row { grid-template-columns: 1fr; gap: 24px; margin-bottom: 50px; }
    .feat-row:nth-child(even) { direction: ltr; }
    .dl-card { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .container { padding: 0 18px; }
    .nav-menu { display: none; }
    .nav-menu.open {
        display: flex;
        position: absolute;
        top: 64px; left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        padding: 12px;
        border-bottom: 1px solid var(--ink-100);
        box-shadow: var(--shadow);
    }
    .nav-toggle { display: block; }
    .feature-grid { grid-template-columns: 1fr; }
    .scenario-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .qr-row { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
}

/* Skip link for a11y */
.skip-link {
    position: absolute;
    left: -999px; top: -999px;
    background: var(--primary);
    color: #fff;
    padding: 8px 14px;
    border-radius: 4px;
    z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

/* Focus ring */
a:focus-visible, button:focus-visible, summary:focus-visible {
    outline: 3px solid var(--primary-soft);
    outline-offset: 2px;
    border-radius: 4px;
}