/**
 * Apple Design System - Google Drive S3 Pool
 * Strictly adhering to design.md tokens, typography, and motion guidelines.
 */

:root {
    /* Colors */
    --primary: #0066cc;
    --primary-focus: #0071e3;
    --primary-on-dark: #2997ff;

    --canvas: #ffffff;
    --canvas-parchment: #f5f5f7;
    --surface-pearl: #fafafc;
    --surface-tile-1: #272729;
    --surface-tile-2: #2a2a2c;
    --surface-tile-3: #252527;
    --surface-black: #000000;
    --surface-chip-translucent: rgba(210, 210, 215, 0.64);

    --ink: #1d1d1f;
    --body-on-dark: #ffffff;
    --body-muted: #cccccc;
    --ink-muted-80: #333333;
    --ink-muted-48: #7a7a7a;

    --divider-soft: rgba(0, 0, 0, 0.04);
    --hairline: rgba(0, 0, 0, 0.08);
    --hairline-dark: rgba(255, 255, 255, 0.12);

    --product-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;

    /* Typography Fonts */
    --font-system: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", sans-serif;

    /* Motion & Easing */
    --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 0.2s;
    --duration-normal: 0.45s;
    --duration-slow: 0.8s;
}

/* -------------------------------------------------------------------------- */
/* Reset & Base Setup                                                         */
/* -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-system);
    font-size: 17px;
    line-height: 1.47;
    letter-spacing: -0.374px;
    font-weight: 400;
    background-color: var(--canvas);
    color: var(--ink);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* -------------------------------------------------------------------------- */
/* Global Nav (True Black 44px) & Sub Nav (Frosted Glass 52px)                */
/* -------------------------------------------------------------------------- */
.global-nav {
    height: 44px;
    background-color: var(--surface-black);
    color: var(--body-on-dark);
    font-size: 12px;
    line-height: 1;
    letter-spacing: -0.12px;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 100;
}

.global-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.global-nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--body-on-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: -0.2px;
}

.global-nav-badge {
    font-size: 10px;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.global-nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.global-nav-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-apple);
}

.global-nav-links a:hover {
    color: var(--body-on-dark);
}

/* Sub Nav Frosted */
.sub-nav-frosted {
    height: 52px;
    position: sticky;
    top: 0;
    z-index: 90;
    background: rgba(245, 245, 247, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--hairline);
    transition:
        background var(--duration-normal) var(--ease-apple),
        box-shadow var(--duration-normal) var(--ease-apple);
}

.sub-nav-frosted.is-scrolled {
    background: rgba(245, 245, 247, 0.92);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.sub-nav-frosted .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.sub-nav-title {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.231px;
    color: var(--ink);
    text-decoration: none;
}

.sub-nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.sub-nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.sub-nav-links a {
    font-size: 14px;
    line-height: 1.29;
    letter-spacing: -0.224px;
    color: var(--ink-muted-80);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-apple);
}

.sub-nav-links a:hover,
.sub-nav-links a.active {
    color: var(--primary);
}

/* -------------------------------------------------------------------------- */
/* Buttons Grammar & Micro-Interactions                                       */
/* -------------------------------------------------------------------------- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: #ffffff;
    font-size: 14px;
    line-height: 1.2;
    letter-spacing: -0.224px;
    font-weight: 400;
    padding: 8px 18px;
    border-radius: 9999px; /* full pill */
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition:
        transform var(--duration-fast) var(--ease-apple),
        background-color var(--duration-fast) var(--ease-apple);
    user-select: none;
}

.btn-primary:hover {
    background-color: #0071e3;
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: scale(0.95); /* Apple system-wide active interaction */
}

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

.btn-hero {
    font-size: 17px;
    padding: 11px 24px;
}

.btn-secondary-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--primary);
    font-size: 17px;
    line-height: 1.2;
    letter-spacing: -0.374px;
    font-weight: 400;
    padding: 10px 22px;
    border-radius: 9999px;
    text-decoration: none;
    border: 1px solid var(--primary);
    cursor: pointer;
    transition:
        transform var(--duration-fast) var(--ease-apple),
        background var(--duration-fast) var(--ease-apple);
}

.btn-secondary-pill:hover {
    background-color: rgba(0, 102, 204, 0.06);
    transform: translateY(-1px);
}

.btn-secondary-pill:active {
    transform: scale(0.95);
}

.btn-secondary-pill-dark {
    color: var(--primary-on-dark);
    border-color: var(--primary-on-dark);
}

.btn-secondary-pill-dark:hover {
    background-color: rgba(41, 151, 255, 0.12);
}

/* -------------------------------------------------------------------------- */
/* Full-Bleed Tile Sections Rhythm (Zero gap, Alternating canvases)            */
/* -------------------------------------------------------------------------- */
.product-tile {
    padding: 80px 0;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.product-tile-light {
    background-color: var(--canvas);
    color: var(--ink);
}

.product-tile-parchment {
    background-color: var(--canvas-parchment);
    color: var(--ink);
}

.product-tile-dark {
    background-color: var(--surface-tile-1);
    color: var(--body-on-dark);
}

.product-tile-dark-2 {
    background-color: var(--surface-tile-2);
    color: var(--body-on-dark);
}

/* Hero Section */
.hero-tile {
    text-align: center;
    padding: 100px 0 80px;
}

.hero-status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 9999px;
    background: var(--canvas-parchment);
    border: 1px solid var(--hairline);
    font-size: 13px;
    font-weight: 600;
    color: var(--ink-muted-80);
    margin-bottom: 24px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #34c759;
    position: relative;
}

.status-dot::after {
    content: "";
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 50%;
    background: #34c759;
    opacity: 0.4;
    animation: pulse-ring 2s infinite var(--ease-apple);
}

@keyframes pulse-ring {
    0% {
        transform: scale(1);
        opacity: 0.6;
    }
    100% {
        transform: scale(2.2);
        opacity: 0;
    }
}

.hero-title {
    font-size: 56px;
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.28px; /* Signature Apple tight */
    color: var(--ink);
    margin-bottom: 16px;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
}

.hero-lead {
    font-size: 28px;
    font-weight: 400;
    line-height: 1.14;
    letter-spacing: 0.196px;
    color: var(--ink-muted-80);
    margin-bottom: 32px;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-bottom: 56px;
    flex-wrap: wrap;
}

/* -------------------------------------------------------------------------- */
/* Interactive Architecture Diagram Component                                 */
/* -------------------------------------------------------------------------- */
.arch-showcase {
    background: #ffffff;
    border: 1px solid var(--hairline);
    border-radius: 18px; /* rounded.lg */
    box-shadow: var(--product-shadow);
    padding: 40px;
    margin: 0 auto;
    max-width: 900px;
    position: relative;
    transition:
        transform var(--duration-normal) var(--ease-apple),
        box-shadow var(--duration-normal) var(--ease-apple);
}

.arch-showcase:hover {
    transform: translateY(-3px);
    box-shadow: rgba(0, 0, 0, 0.18) 0 20px 40px -10px;
}

.arch-pipeline {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.arch-node {
    background: var(--canvas-parchment);
    border: 1px solid var(--hairline);
    border-radius: 14px;
    padding: 20px 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.arch-node:hover {
    background: #ffffff;
    border-color: var(--primary);
    transform: scale(1.03);
    box-shadow: 0 8px 24px rgba(0, 102, 204, 0.12);
}

.arch-node-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    color: var(--primary);
    transition:
        transform var(--duration-fast) var(--ease-apple),
        color var(--duration-fast) var(--ease-apple);
}

.arch-node:hover .arch-node-icon {
    transform: scale(1.1);
}

.arch-node-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 4px;
}

.arch-node-desc {
    font-size: 12px;
    color: var(--ink-muted-48);
}

.arch-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--primary);
    font-weight: 600;
    font-size: 12px;
}

.connector-line {
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, #0066cc, #2997ff);
    position: relative;
    margin: 6px 0;
}

.connector-line::after {
    content: "";
    position: absolute;
    right: 0;
    top: -3px;
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid #2997ff;
}

.arch-info-banner {
    background: var(--canvas-parchment);
    border-radius: 10px;
    padding: 12px 18px;
    font-size: 13px;
    color: var(--ink-muted-80);
    text-align: center;
    border: 1px solid var(--hairline);
    transition: all var(--duration-fast) var(--ease-apple);
}

.arch-info-banner.highlight {
    background: rgba(0, 102, 204, 0.08);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

/* -------------------------------------------------------------------------- */
/* Utility Cards & Store Grid (Apple Rounded 18px)                            */
/* -------------------------------------------------------------------------- */
.tile-headline {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 12px;
    text-align: center;
}

.tile-tagline {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.231px;
    text-align: center;
    margin-bottom: 48px;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.product-tile-light .tile-tagline,
.product-tile-parchment .tile-tagline {
    color: var(--ink-muted-80);
}

.product-tile-dark .tile-tagline,
.product-tile-dark-2 .tile-tagline {
    color: var(--body-muted);
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.card-apple {
    background: #ffffff;
    border: 1px solid var(--hairline);
    border-radius: 18px; /* rounded.lg */
    padding: 32px 28px;
    transition:
        transform var(--duration-normal) var(--ease-apple),
        border-color var(--duration-normal) var(--ease-apple),
        box-shadow var(--duration-normal) var(--ease-apple);
    position: relative;
    overflow: hidden;
}

.card-apple:hover {
    border-color: rgba(0, 102, 204, 0.3);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.06);
}

.card-apple-dark {
    background: var(--surface-tile-2);
    border-color: var(--hairline-dark);
    color: var(--body-on-dark);
}

.card-apple-dark:hover {
    border-color: var(--primary-on-dark);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.card-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--canvas-parchment);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 20px;
    transition:
        transform var(--duration-fast) var(--ease-apple),
        background var(--duration-fast) var(--ease-apple);
}

.card-apple-dark .card-icon-wrap {
    background: rgba(255, 255, 255, 0.08);
    color: var(--primary-on-dark);
}

.card-apple:hover .card-icon-wrap {
    transform: scale(1.08);
}

.card-apple h3 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: 10px;
}

.card-apple p {
    font-size: 15px;
    line-height: 1.5;
    color: var(--ink-muted-80);
}

.card-apple-dark p {
    color: var(--body-muted);
}

/* -------------------------------------------------------------------------- */
/* Interactive Code Widget (Pill Tabs + Micro Copy Button)                    */
/* -------------------------------------------------------------------------- */
.code-widget {
    background: #1d1d1f;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    box-shadow: var(--product-shadow);
    margin: 32px 0;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-tabs {
    display: flex;
    gap: 8px;
}

.tab-btn {
    background: transparent;
    color: #a1a1a6;
    border: none;
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 9999px;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.tab-btn:hover {
    color: #ffffff;
}

.tab-btn.active {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-apple);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.copy-btn.copied {
    background: #34c759;
    border-color: #34c759;
    color: #ffffff;
}

.code-pane {
    display: none;
    padding: 24px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 14px;
    line-height: 1.6;
    color: #e4e4e7;
    overflow-x: auto;
}

.code-pane.active {
    display: block;
    animation: fadeIn var(--duration-fast) var(--ease-apple);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* -------------------------------------------------------------------------- */
/* Legal & Editorial Content Sections                                         */
/* -------------------------------------------------------------------------- */
.editorial-container {
    background: #ffffff;
    border: 1px solid var(--hairline);
    border-radius: 18px;
    padding: 48px;
    margin: 40px auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.editorial-header {
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 24px;
    margin-bottom: 36px;
}

.editorial-header h1 {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.2px;
    margin-bottom: 8px;
}

.editorial-date {
    font-size: 14px;
    color: var(--ink-muted-48);
}

.editorial-container h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--ink);
    margin: 32px 0 12px;
}

.editorial-container p,
.editorial-container ul {
    font-size: 17px;
    line-height: 1.47;
    color: var(--ink);
    margin-bottom: 16px;
}

.editorial-container ul {
    padding-left: 24px;
}

.editorial-container li {
    margin-bottom: 8px;
}

.legal-callout-box {
    background: var(--canvas-parchment);
    border-left: 4px solid var(--primary);
    border-radius: 0 12px 12px 0;
    padding: 20px 24px;
    margin: 28px 0;
}

.legal-callout-box p {
    color: var(--ink);
    font-size: 16px;
    margin: 0;
}

.legal-callout-box a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.legal-callout-box a:hover {
    text-decoration: underline;
}

/* -------------------------------------------------------------------------- */
/* Footer (Parchment with Dense Links 2.41 Line Height)                       */
/* -------------------------------------------------------------------------- */
.footer-parchment {
    background-color: var(--canvas-parchment);
    border-top: 1px solid var(--hairline);
    padding: 64px 0 40px;
    color: var(--ink-muted-80);
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.29;
    letter-spacing: -0.224px;
    color: var(--ink);
    margin-bottom: 12px;
}

.footer-col ul {
    list-style: none;
}

.footer-col a {
    font-size: 14px;
    line-height: 2.2; /* Dense link cadence from design.md */
    color: var(--ink-muted-80);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-apple);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--hairline);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 12px;
    line-height: 1;
    letter-spacing: -0.12px;
    color: var(--ink-muted-48);
}

.footer-legal-links {
    display: flex;
    gap: 20px;
}

.footer-legal-links a {
    color: var(--ink-muted-48);
    text-decoration: none;
}

.footer-legal-links a:hover {
    color: var(--primary);
}

/* -------------------------------------------------------------------------- */
/* Scroll-triggered reveal animations                                        */
/* -------------------------------------------------------------------------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(28px);
    transition:
        opacity var(--duration-slow) var(--ease-apple),
        transform var(--duration-slow) var(--ease-apple);
    will-change: opacity, transform;
}

[data-reveal].is-revealed {
    opacity: 1;
    transform: translateY(0);
}

/* -------------------------------------------------------------------------- */
/* Responsive Breakpoints (matching design.md)                                */
/* -------------------------------------------------------------------------- */
@media (max-width: 834px) {
    .hero-title {
        font-size: 40px;
    }
    .hero-lead {
        font-size: 22px;
    }
    .tile-headline {
        font-size: 32px;
    }
    .arch-pipeline {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .arch-connector {
        transform: rotate(90deg);
        margin: 8px 0;
    }
    .editorial-container {
        padding: 24px;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 32px;
    }
    .hero-lead {
        font-size: 18px;
    }
    .sub-nav-links {
        display: none;
    }
    .product-tile {
        padding: 48px 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    [data-reveal] {
        opacity: 1 !important;
        transform: none !important;
    }
}