:root,
[data-theme="light"] {
    color-scheme: light;
    --tia-blue-900: #0a5697;
    --tia-blue-600: #0b5fa5;
    --tia-blue-400: #2b8acc;
    --tia-bg-page: #f3f7fb;
    --tia-bg-card: #ffffff;
    --tia-bg-subtle: #f8fbfe;
    --tia-text-primary: #0f172a;
    --tia-text-secondary: #254160;
    --tia-text-muted: #6b7f95;
    --tia-text-faded: #94a3b8;
    --tia-border-light: #e6eef6;
    --tia-border-medium: #d8e4f0;
    --tia-border-input: #cfe0ef;
    --tia-link: #0b5fa5;
    --tia-link-hover: #2b8acc;
    --tia-shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
    --tia-shadow-md: 0 8px 24px rgba(15, 23, 42, .08);
    --tia-shadow-lg: 0 18px 42px rgba(15, 23, 42, .08);
    --tia-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --tia-dark-bg: #0a1628;
    --tia-dark-bg-2: #0f2137;
    --tia-dark-accent: #2b8acc;
    --tia-dark-text: #ffffff;
    --tia-dark-text-muted: rgba(255, 255, 255, .72);
    --tia-dark-border: rgba(255, 255, 255, .12);
}

[data-theme="dark"] {
    color-scheme: dark;
    --tia-bg-page: #111827;
    --tia-bg-card: #172033;
    --tia-bg-subtle: #1f2a44;
    --tia-text-primary: #e8eef8;
    --tia-text-secondary: #c7d5e8;
    --tia-text-muted: #9aaec5;
    --tia-text-faded: #74869b;
    --tia-border-light: #29384f;
    --tia-border-medium: #33455f;
    --tia-border-input: #40536f;
    --tia-link: #7dc5f3;
    --tia-link-hover: #a6daf8;
    --tia-dark-bg: #050a12;
    --tia-dark-bg-2: #0a1525;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    background: var(--tia-bg-page);
    color: var(--tia-text-primary);
    font-family: var(--tia-font);
    line-height: 1.5;
}

a {
    color: var(--tia-link);
    text-decoration: none;
}

a:hover {
    color: var(--tia-link-hover);
    text-decoration: underline;
}

.landing-header {
    background: var(--tia-bg-card);
    border-bottom: 1px solid var(--tia-border-light);
}

.landing-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.landing-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--tia-text-primary);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.1;
}

.landing-brand img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.landing-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 14px;
}

.landing-nav a {
    color: var(--tia-text-secondary);
}

.theme-toggle {
    width: 36px;
    height: 36px;
    border: 1px solid var(--tia-border-light);
    border-radius: 8px;
    background: var(--tia-bg-card);
    color: var(--tia-text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.theme-toggle:hover {
    background: var(--tia-bg-subtle);
    color: var(--tia-text-primary);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

[data-theme="dark"] .theme-icon-moon,
[data-theme="light"] .theme-icon-sun {
    display: none;
}

.landing-hero {
    background: linear-gradient(90deg, var(--tia-blue-900) 0%, var(--tia-blue-600) 45%, var(--tia-blue-400) 100%);
}

.landing-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 52px 24px 56px;
    text-align: center;
}

.landing-hero-title {
    margin: 0 0 14px;
    color: #ffffff;
    font-size: 28px;
    line-height: 1.2;
    font-weight: 700;
}

.landing-hero-subtitle {
    margin: 0 auto 22px;
    max-width: 760px;
    color: rgba(255, 255, 255, .92);
    font-size: 18px;
    line-height: 1.5;
}

.landing-main {
    min-height: 48vh;
}

.quotes-section,
#quotes {
    max-width: 980px;
    margin: 0 auto;
    padding: 36px 24px 24px;
}

.quote-card,
.quote-landing-card {
    background: var(--tia-bg-card);
    border: 1px solid var(--tia-border-light);
    border-radius: 22px;
    padding: 32px;
    text-align: center;
    box-shadow: var(--tia-shadow-sm);
}

.quote-text {
    margin: 0;
    color: var(--tia-text-secondary);
    font-size: 18px;
    font-style: italic;
    line-height: 1.7;
}

.quote-meta {
    margin-top: 16px;
    color: var(--tia-text-muted);
    font-size: 14px;
    display: grid;
    gap: 4px;
}

.login-section {
    max-width: 420px;
    margin: 0 auto;
    padding: 10px 24px 48px;
}

.landing-card,
.login-card,
.forgot-card,
.register-card,
.help-card,
.help-hero,
.guide-card,
.lookup-card {
    background: var(--tia-bg-card);
    border: 1px solid var(--tia-border-light);
    border-radius: 18px;
    box-shadow: var(--tia-shadow-md);
}

.login-card,
.register-card {
    padding: 28px 24px;
}

.forgot-card,
.lookup-card,
.guide-card,
.help-card {
    padding: 24px;
}

.login-title,
.register-title {
    margin: 0 0 24px;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--tia-text-primary);
}

.form-stack,
.form-group,
.form-grid {
    display: grid;
    gap: 12px;
}

.form-row {
    margin-top: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--tia-text-muted);
    font-size: 14px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-input,
.landing-input,
.lookup-card input,
.card input {
    width: 100%;
    border: 1px solid var(--tia-border-input);
    border-radius: 12px;
    padding: 12px 14px;
    color: var(--tia-text-primary);
    background: var(--tia-bg-card);
    font: inherit;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}

.form-input:focus,
.landing-input:focus,
.lookup-card input:focus,
.card input:focus {
    border-color: var(--tia-blue-400);
    box-shadow: 0 0 0 3px rgba(43, 138, 204, .18);
}

.btn,
.landing-btn,
.help-btn,
.about-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 12px;
    background: var(--tia-blue-600);
    color: #ffffff;
    padding: 12px 16px;
    font: inherit;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover,
.landing-btn:hover,
.help-btn:hover,
.about-cta:hover {
    background: var(--tia-blue-400);
    color: #ffffff;
    text-decoration: none;
}

.btn-block,
.landing-btn.block {
    width: 100%;
    margin-top: 16px;
}

.btn-outline,
.help-btn.secondary {
    background: var(--tia-bg-subtle);
    border: 1px solid var(--tia-border-light);
    color: var(--tia-text-primary);
}

.notice,
.landing-notice {
    margin-bottom: 16px;
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 14px;
}

.notice.success {
    background: #ecfdf5;
    color: #166534;
}

.notice.error,
.landing-notice.error {
    border: 1px solid #f8c1b9;
    background: #fde6e2;
    color: #8a1f11;
}

.about-shell {
    display: flex;
    min-height: calc(100vh - 56px - 300px);
}

.about-dark-panel {
    flex: 0 0 380px;
    background: linear-gradient(180deg, var(--tia-dark-bg) 0%, var(--tia-dark-bg-2) 100%);
    padding: 48px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.about-dark-panel::before {
    content: "";
    position: absolute;
    inset: -50%;
    background: radial-gradient(circle at 30% 70%, rgba(43, 138, 204, .15) 0%, transparent 50%);
}

.about-dark-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.about-dark-content {
    position: relative;
    z-index: 1;
}

.about-dark-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: rgba(43, 138, 204, .2);
    border: 1px solid rgba(43, 138, 204, .3);
    border-radius: 20px;
    color: var(--tia-dark-accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.about-dark-title {
    margin: 0 0 20px;
    color: var(--tia-dark-text);
    font-size: 36px;
    font-weight: 700;
    line-height: 1.15;
}

.about-dark-subtitle {
    margin: 0 0 32px;
    color: var(--tia-dark-text-muted);
    font-size: 16px;
    line-height: 1.7;
}

.about-dark-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.about-dark-stat {
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--tia-dark-border);
    border-radius: 14px;
    padding: 16px;
}

.about-dark-stat-value {
    color: var(--tia-dark-accent);
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 4px;
}

.about-dark-stat-label {
    color: var(--tia-dark-text-muted);
    font-size: 12px;
    letter-spacing: .05em;
    text-transform: uppercase;
}

.about-content {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 40px 56px;
}

.about-intro {
    margin-bottom: 32px;
}

.about-kicker {
    margin: 0 0 8px;
    color: var(--tia-blue-600);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
}

.about-title {
    margin: 0;
    color: var(--tia-text-primary);
    font-size: 28px;
    line-height: 1.15;
}

.about-subtitle {
    margin: 12px 0 0;
    max-width: 760px;
    color: var(--tia-text-muted);
    font-size: 15px;
    line-height: 1.7;
}

.stack,
.about-stack,
.guides-wrap,
.help-shell {
    display: grid;
    gap: 20px;
}

.grid-2,
.about-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.group-grid,
.about-group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.panel,
.about-panel {
    background: var(--tia-bg-card);
    border: 1px solid var(--tia-border-medium);
    border-radius: 22px;
    box-shadow: 0 10px 28px rgba(15, 23, 42, .06);
}

.panel-body,
.about-panel-body {
    padding: 22px;
}

.panel h2,
.about-panel h2 {
    margin: 0 0 10px;
    color: var(--tia-text-primary);
    font-size: 18px;
}

.mini-card,
.about-mini-card {
    padding: 18px;
    border-radius: 18px;
    border: 1px solid var(--tia-border-medium);
    background: var(--tia-bg-subtle);
}

.mini-card h3,
.about-mini-card h3,
.guide-card h3,
.help-card h3,
.help-hero h1,
.lookup-card h2,
.lookup-card h3 {
    margin: 0 0 10px;
    color: var(--tia-text-primary);
}

.muted,
.mini-card p,
.about-mini-card p,
.guide-card p,
.help-card p,
.help-hero p,
.lookup-card p {
    color: var(--tia-text-muted);
}

.list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding-left: 18px;
}

.meta {
    color: var(--tia-text-muted);
    font-size: 13px;
}

.meta-spaced,
.section-lead {
    margin-top: 8px;
}

.help-shell {
    max-width: 980px;
    margin: 0 auto;
    padding: 36px 24px;
}

.help-hero {
    padding: 28px;
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.help-footer-cta {
    display: flex;
    justify-content: center;
}

.lookup-stack {
    max-width: 760px;
    margin: 0 auto;
    padding: 36px 24px;
    display: grid;
    gap: 18px;
}

.forgot-section,
.register-section {
    padding: 48px 24px;
}

.forgot-card,
.register-card {
    max-width: 420px;
    margin: 0 auto;
}

.landing-footer {
    margin-top: 8px;
    padding: 20px 24px 24px;
    border-top: 1px solid var(--tia-border-light);
    color: var(--tia-text-muted);
    font-size: 13px;
}

.landing-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.landing-footer-build {
    color: var(--tia-text-faded);
    font-size: 11px;
    font-style: italic;
    letter-spacing: .01em;
}

@media (max-width: 960px) {
    .about-shell {
        flex-direction: column;
    }

    .about-dark-panel {
        flex: none;
        min-height: auto;
        padding: 40px 24px;
    }

    .about-content {
        padding: 36px 24px 48px;
    }

    .grid-2,
    .about-grid-2,
    .help-grid {
        grid-template-columns: 1fr;
    }

    .about-title,
    .about-dark-title {
        font-size: 28px;
    }
}

@media (max-width: 640px) {
    .landing-header-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .landing-nav {
        flex-wrap: wrap;
        gap: 12px;
    }

    .landing-hero-inner {
        padding: 42px 20px 46px;
    }

    .quote-card,
    .quote-landing-card {
        padding: 20px;
    }

    .form-row {
        align-items: flex-start;
        flex-direction: column;
    }
}