:root {
    --bg-top: #07112b;
    --bg-mid: #111b43;
    --bg-bottom: #1b1240;
    --panel: rgba(18, 24, 57, 0.74);
    --panel-strong: rgba(22, 29, 70, 0.92);
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.15);
    --text: #f5f2ff;
    --muted: #c9c4e2;
    --muted-strong: #e5deff;
    --accent: #b894ff;
    --accent-deep: #8f66f1;
    --glow: #f7e7bc;
    --success: #8bdcc1;
    --warning: #ffcf80;
    --danger: #ff8f9e;
    --shadow: 0 28px 60px rgba(3, 7, 18, 0.42);
    --radius-xl: 30px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --content-width: 1200px;
    --tabbar-mobile-height: 5.8rem;
    --floating-action-mobile-offset: 5rem;
}

* {
    box-sizing: border-box;
}

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

body {
    font-family: "Avenir Next", "Nunito Sans", "Trebuchet MS", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 15%, rgba(247, 231, 188, 0.12), transparent 26%),
        radial-gradient(circle at 82% 24%, rgba(184, 148, 255, 0.18), transparent 28%),
        radial-gradient(circle at 68% 78%, rgba(139, 220, 193, 0.10), transparent 22%),
        linear-gradient(180deg, var(--bg-top), var(--bg-mid) 48%, var(--bg-bottom));
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

a {
    color: inherit;
    text-decoration: none;
}

.hidden {
    display: none !important;
}

.app-shell {
    width: min(var(--content-width), calc(100% - 1.5rem));
    margin: 0 auto;
    padding: max(0.75rem, env(safe-area-inset-top)) 0 calc(var(--tabbar-mobile-height) + 1.5rem + env(safe-area-inset-bottom));
}

.app-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 0.75rem 0 1rem;
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-mark,
.welcome-mark {
    width: 3rem;
    height: 3rem;
    border-radius: 18px;
    background:
        radial-gradient(circle at 35% 30%, rgba(247, 231, 188, 0.95), transparent 25%),
        linear-gradient(160deg, #3b2c78, #121b50 56%, #07112b);
    position: relative;
    box-shadow: 0 12px 24px rgba(5, 8, 18, 0.35);
}

.brand-mark::after,
.welcome-mark::after {
    content: "✦";
    position: absolute;
    top: 0.45rem;
    right: 0.5rem;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
}

.brand-block small {
    display: block;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.7rem;
}

.brand-block strong {
    font-size: 1.15rem;
}

.site-links {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.site-links a {
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
}

.app-layout {
    position: relative;
    display: grid;
    gap: 1rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page-scroll {
    display: grid;
    gap: 1rem;
    position: relative;
}

.page-scroll > * {
    min-width: 0;
}

.page-scroll-with-action {
    padding-bottom: calc(var(--tabbar-mobile-height) + 5rem + env(safe-area-inset-bottom));
}

.overview-background {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.star,
.orb {
    position: absolute;
}

.star {
    color: rgba(247, 231, 188, 0.6);
    animation: starFloat 8s ease-in-out infinite alternate;
}

.star-a { top: 2.5rem; left: 8%; font-size: 1rem; }
.star-b { top: 8rem; right: 12%; font-size: 1.25rem; animation-duration: 10s; }
.star-c { top: 28rem; left: 18%; font-size: 0.85rem; animation-duration: 9s; }

.orb {
    border-radius: 999px;
    filter: blur(24px);
    opacity: 0.34;
    animation: orbDrift 11s ease-in-out infinite alternate;
}

.orb-a {
    width: 11rem;
    height: 11rem;
    right: 4%;
    top: 16rem;
    background: rgba(184, 148, 255, 0.22);
}

.orb-b {
    width: 8rem;
    height: 8rem;
    left: 10%;
    top: 24rem;
    background: rgba(247, 231, 188, 0.16);
    animation-duration: 14s;
}

@keyframes starFloat {
    from { transform: translateY(0) scale(0.95); opacity: 0.45; }
    to { transform: translateY(-8px) scale(1.04); opacity: 0.82; }
}

@keyframes orbDrift {
    from { transform: translate3d(0, 0, 0) scale(0.96); }
    to { transform: translate3d(10px, -12px, 0) scale(1.05); }
}

.hero-card,
.glass-card,
.compact-header-card {
    position: relative;
    z-index: 1;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--panel);
    backdrop-filter: blur(14px);
    box-shadow: var(--shadow);
}

.hero-card {
    padding: 1.4rem;
    background: linear-gradient(160deg, rgba(58, 48, 123, 0.92), rgba(20, 33, 82, 0.86));
}

.compact-header-card {
    padding: 1.15rem 1.2rem;
}

.hero-copy h1,
.compact-header-card h2,
.section-heading h2,
.section-heading-row h2 {
    margin: 0;
    line-height: 1.02;
}

.eyebrow {
    margin: 0 0 0.75rem;
    display: inline-flex;
    gap: 0.45rem;
    padding: 0.42rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.06);
    color: var(--muted-strong);
    font-size: 0.82rem;
}

.primary-chip,
.badge,
.button {
    border: 0;
    border-radius: 999px;
}

.primary-chip {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    background: rgba(255, 255, 255, 0.12);
    color: var(--text);
    font-weight: 700;
}

.hero-pills,
.metric-grid,
.split-grid,
.stepper-grid {
    display: grid;
    gap: 0.85rem;
}

.hero-pills {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 1rem;
}

.summary-pill,
.metric-card,
.field-panel,
.stepper-card,
.toggle-card,
.activity-button,
.history-pill,
.link-stack a {
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(255, 255, 255, 0.05);
}

.summary-pill,
.metric-card,
.history-pill {
    padding: 0.85rem;
    border-radius: var(--radius-md);
}

.summary-pill span,
.metric-card span,
.history-pill span {
    display: block;
    color: var(--muted);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.summary-pill strong,
.metric-card strong,
.history-pill strong {
    display: block;
    margin-top: 0.25rem;
    font-size: 1rem;
}

.metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric-card p {
    margin: 0.5rem 0 0;
    color: var(--muted);
    line-height: 1.6;
    font-size: 0.92rem;
}

@media (min-width: 1180px) {
    .app-shell {
        width: min(1360px, calc(100% - 2.5rem));
        min-height: calc(100vh - 1.5rem);
        padding-top: 1.25rem;
    }

    .app-topbar {
        padding: 0.4rem 0 0.9rem;
    }

    .brand-block {
        min-width: 240px;
    }

    .site-links {
        justify-content: flex-end;
    }

    .site-links a {
        padding: 0.72rem 1rem;
    }

    .tabbar {
        width: min(780px, 100%);
        margin-left: auto;
        margin-right: auto;
        margin-bottom: 0.75rem;
    }

    .page[data-page="overview"] .page-scroll {
        grid-template-columns: repeat(12, minmax(0, 1fr));
        align-items: start;
        gap: 1.25rem;
    }

    .overview-hero,
    .overview-metrics {
        grid-column: 1 / -1;
    }

    .overview-hero {
        display: grid;
        grid-template-columns: minmax(0, 1.6fr) minmax(220px, 0.55fr);
        gap: 1.1rem;
        align-items: center;
        padding: 1.55rem 1.6rem;
    }

    .overview-hero .primary-chip {
        margin-top: 0;
        justify-self: end;
        align-self: start;
        min-width: 190px;
    }

    .overview-hero .hero-pills {
        grid-column: 1 / -1;
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .overview-history {
        grid-column: 1 / span 7;
    }

    .overview-coach {
        grid-column: 8 / -1;
        height: 100%;
    }

    .metric-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .metric-card {
        min-height: 9.25rem;
    }

    .chart-wrap {
        height: clamp(14rem, 20vw, 18rem);
    }

    .page[data-page="log"] .page-scroll,
    .page[data-page="history"] .page-scroll,
    .page[data-page="settings"] .page-scroll {
        width: min(100%, 1240px);
        margin: 0 auto;
    }

    .page[data-page="log"] .form-stack {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }

    .page[data-page="log"] .form-stack > .glass-card:last-child {
        grid-column: 1 / -1;
    }

    .page[data-page="history"] .history-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .page[data-page="settings"] .page-scroll {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }

    .page[data-page="settings"] .page-scroll > .compact-header-card {
        grid-column: 1 / -1;
    }

    .page[data-page="settings"] .page-scroll > .glass-card {
        min-height: 100%;
    }

    .glass-card,
    .compact-header-card {
        padding: 1.35rem 1.4rem;
    }

    .history-card {
        height: 100%;
    }
}

.section-heading,
.section-heading-row {
    margin-bottom: 1rem;
}

.section-heading p,
.section-heading-row p,
.helper,
.slider-copy small,
.field-copy label,
.toggle-card small,
.empty-state p,
.coach-output p {
    color: var(--muted);
}

.section-heading-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
}

.badge {
    align-self: flex-start;
    padding: 0.55rem 0.8rem;
    background: rgba(247, 231, 188, 0.12);
    color: var(--glow);
    font-size: 0.82rem;
    white-space: nowrap;
}

.badge.soft {
    background: rgba(184, 148, 255, 0.12);
    color: var(--accent-soft);
}

.chart-wrap {
    height: clamp(12rem, 32vw, 15rem);
    border-radius: 18px;
    background:
        linear-gradient(180deg, rgba(184, 148, 255, 0.18), rgba(184, 148, 255, 0.03)),
        rgba(255, 255, 255, 0.03);
    overflow: hidden;
}

#sleep-chart {
    width: 100%;
    height: 100%;
    display: block;
}

.empty-state,
.coach-output {
    padding: 1rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    margin-bottom: 1rem;
}

.empty-state h3,
.coach-output h3,
.history-card h3 {
    margin-top: 0;
}

.coach-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.button {
    padding: 0.9rem 1.15rem;
    font-weight: 700;
    color: var(--text);
    min-width: 0;
}

.button-primary {
    background: linear-gradient(135deg, #c2a6ff, #9f78ff);
    color: #120b25;
}

.button-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--line);
}

.flex-grow {
    flex: 1;
}

.form-stack {
    display: grid;
    gap: 1rem;
}

.field-group {
    display: grid;
    gap: 0.65rem;
}

.field-panel {
    padding: 0.95rem 1rem;
    border-radius: var(--radius-md);
}

.field-inline,
.slider-row,
.history-top,
.stepper-control {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

.field-inline-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
}

.field-copy strong,
.slider-row strong {
    font-size: 1rem;
}

label {
    display: block;
    font-weight: 600;
}

input[type="date"],
input[type="time"],
select,
textarea,
input[type="text"] {
    width: 100%;
    border-radius: 14px;
    border: 1px solid var(--line-strong);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    padding: 0.82rem 0.9rem;
}

select,
input,
textarea,
button {
    max-width: 100%;
}

textarea {
    resize: vertical;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

details summary {
    cursor: pointer;
    font-weight: 700;
}

.details-body {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
    gap: 0.7rem;
}

.activity-button {
    border-radius: 14px;
    padding: 0.85rem 0.9rem;
    color: var(--muted-strong);
    text-align: left;
}

.activity-button.active {
    background: rgba(184, 148, 255, 0.24);
    color: var(--text);
}

.selected-activities {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.selected-chip {
    padding: 0.5rem 0.8rem;
    border-radius: 999px;
    background: rgba(184, 148, 255, 0.18);
}

.toggle-card {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 1rem;
    border-radius: var(--radius-md);
}

.toggle-card input {
    margin-top: 0.3rem;
}

.stepper-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stepper-card {
    padding: 1rem;
    border-radius: var(--radius-md);
    display: grid;
    gap: 0.75rem;
}

.stepper-control {
    justify-content: flex-end;
}

.stepper-control button {
    width: 2.1rem;
    height: 2.1rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
}

.floating-action-bar {
    position: fixed;
    left: 50%;
    bottom: calc(var(--floating-action-mobile-offset) + env(safe-area-inset-bottom));
    transform: translateX(-50%);
    width: min(calc(100% - 1rem), var(--content-width));
    padding: 0.9rem 0.5rem 0.35rem;
    display: flex;
    gap: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(8, 12, 30, 0.78);
    backdrop-filter: blur(16px);
    z-index: 30;
}

.history-list {
    display: grid;
    gap: 1rem;
}

.history-card {
    padding: 1rem;
}

.history-actions {
    display: flex;
    gap: 0.55rem;
    flex-wrap: wrap;
}

.icon-button {
    padding: 0.65rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
}

.history-hours {
    margin: 0.35rem 0 0;
    color: var(--muted);
}

.history-pills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 0.7rem;
    margin-top: 0.9rem;
}

.history-activities,
.history-notes {
    margin-top: 0.9rem;
    padding: 0.95rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
}

.history-activities-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 0.6rem;
}

.link-stack {
    display: grid;
    gap: 0.7rem;
}

.link-stack a {
    display: block;
    padding: 0.9rem 1rem;
    border-radius: 14px;
}

.tabbar {
    position: fixed;
    left: 50%;
    bottom: calc(0.8rem + env(safe-area-inset-bottom));
    transform: translateX(-50%);
    width: min(calc(100% - 1rem), 720px);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.55rem;
    padding: 0.55rem;
    border-radius: 26px;
    border: 1px solid var(--line);
    background: rgba(8, 12, 30, 0.78);
    backdrop-filter: blur(16px);
    z-index: 40;
}

.tab {
    border: 0;
    border-radius: 18px;
    padding: 0.85rem 0.7rem;
    background: transparent;
    color: var(--muted);
    font-weight: 700;
}

.tab.active {
    background: rgba(184, 148, 255, 0.18);
    color: var(--text);
}

@media (min-width: 1024px) {
    .app-shell {
        padding-bottom: 2rem;
    }

    .tabbar {
        position: sticky;
        top: max(0.75rem, env(safe-area-inset-top));
        left: auto;
        bottom: auto;
        transform: none;
        width: 100%;
        margin-bottom: 0.25rem;
    }

    .page-scroll-with-action {
        padding-bottom: 2rem;
    }

    .floating-action-bar {
        position: sticky;
        left: auto;
        bottom: 1rem;
        transform: none;
        width: 100%;
        margin-top: -0.25rem;
        margin-bottom: 1rem;
        border: 1px solid var(--line);
        border-radius: 22px;
        justify-content: flex-end;
    }

    .floating-action-bar .button {
        width: auto;
    }
}

.welcome-overlay {
    position: fixed;
    inset: 0;
    background: rgba(3, 6, 18, 0.72);
    backdrop-filter: blur(10px);
    display: grid;
    place-items: center;
    padding: 1rem;
    z-index: 60;
}

.welcome-card {
    width: min(700px, 100%);
    max-height: min(90vh, 820px);
    overflow: auto;
    border-radius: 28px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(14, 23, 55, 0.96), rgba(29, 20, 63, 0.94));
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.welcome-card h2 {
    margin: 0.85rem 0 0;
    font-size: clamp(2rem, 6vw, 3rem);
}

.lead-tight {
    margin-top: 0.85rem;
    color: var(--muted);
    line-height: 1.75;
}

.welcome-benefits {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    margin: 1.2rem 0;
}

.welcome-benefits article {
    padding: 0.95rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.06);
}

.welcome-benefits strong {
    display: block;
    margin-bottom: 0.35rem;
}

.welcome-benefits span,
.welcome-disclaimer {
    color: var(--muted);
    line-height: 1.7;
}

.welcome-disclaimer {
    margin-bottom: 1rem;
}

@media (max-width: 980px) {
    .app-shell {
        width: min(calc(100% - 0.8rem), var(--content-width));
    }

    .app-topbar,
    .section-heading-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .metric-grid,
    .split-grid,
    .hero-pills,
    .welcome-benefits {
        grid-template-columns: 1fr;
    }

    .floating-action-bar {
        width: calc(100% - 0.8rem);
    }
}

@media (max-width: 1023px) {
    .tabbar {
        z-index: 45;
    }
}

@media (max-width: 768px) {
    .hero-card,
    .glass-card,
    .compact-header-card,
    .welcome-card {
        padding: 1.1rem;
    }

    .field-inline,
    .slider-row,
    .history-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .history-actions {
        width: 100%;
    }

    .history-actions .icon-button {
        flex: 1;
    }

    .stepper-control {
        width: 100%;
        justify-content: space-between;
    }
}

@media (max-width: 640px) {
    .site-links,
    .coach-actions {
        width: 100%;
    }

    .site-links {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .coach-actions,
    .field-inline-grid,
    .floating-action-bar {
        grid-template-columns: 1fr;
        flex-direction: column;
    }

    .page-scroll-with-action {
        padding-bottom: 12.5rem;
    }

    .floating-action-bar {
        bottom: calc(6.8rem + env(safe-area-inset-bottom));
        padding-bottom: calc(0.45rem + env(safe-area-inset-bottom));
    }

    .tabbar {
        width: calc(100% - 0.8rem);
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.35rem;
        padding: 0.4rem;
    }

    .tab {
        padding: 0.72rem 0.35rem;
        font-size: 0.82rem;
    }
}

@media (max-width: 560px) {
    .app-shell {
        width: calc(100% - 0.6rem);
    }

    .brand-block {
        width: 100%;
    }

    .site-links {
        grid-template-columns: 1fr;
    }

    .field-inline-grid,
    .coach-actions,
    .floating-action-bar {
        display: grid;
        grid-template-columns: 1fr;
    }

    .button,
    .primary-chip,
    .icon-button {
        width: 100%;
    }

    .tabbar {
        gap: 0.3rem;
        padding: 0.35rem;
    }

    .tab {
        width: auto;
        min-width: 0;
        padding: 0.68rem 0.2rem;
        font-size: 0.76rem;
    }

    .page-scroll-with-action {
        padding-bottom: 11.5rem;
    }

    .floating-action-bar {
        bottom: calc(5.9rem + env(safe-area-inset-bottom));
    }
}

@media (max-width: 420px) {
    .app-shell {
        width: calc(100% - 0.4rem);
    }

    .hero-card,
    .glass-card,
    .compact-header-card,
    .welcome-card {
        border-radius: 18px;
        padding: 1rem 0.9rem;
    }

    .eyebrow {
        font-size: 0.76rem;
    }

    .history-pills,
    .stepper-grid,
    .activity-grid {
        grid-template-columns: 1fr;
    }
}