/* Smart Tangibles Companion Site - Stylesheet */

/* ================================
   CSS Variables & Reset
   ================================ */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #475569;
    --color-accent: #0891b2;

    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;

    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

ul, ol {
    list-style: none;
}

/* ================================
   Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

@media (min-width: 768px) {
    h1 { font-size: var(--font-size-5xl); }
    h2 { font-size: var(--font-size-4xl); }
}

/* ================================
   Layout
   ================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
}

.section-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 700px;
    margin-bottom: var(--spacing-2xl);
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

a.btn-primary,
.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: white;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
}

.btn-tool {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    width: 100%;
    margin-top: auto;
}

.btn-tool:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-full {
    width: 100%;
}

/* ================================
   Navigation
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    text-decoration: none;
}

.logo-tangibles {
    color: var(--color-primary);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-menu a {
    color: var(--color-text-light);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: white;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        gap: var(--spacing-md);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }
}

/* ================================
   Hero Section
   ================================ */
.hero {
    min-height: 0;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    padding-top: calc(var(--spacing-3xl) + 60px);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-2xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-book-cover {
    max-width: 260px;
    width: 100%;
    border-radius: 6px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.1);
}

.hero-graphic {
    position: relative;
    width: 300px;
    height: 300px;
}

.orbit {
    position: absolute;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    animation: orbit-rotate 20s linear infinite;
}

.orbit-1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.orbit-2 {
    width: 70%;
    height: 70%;
    top: 15%;
    left: 15%;
    animation-duration: 15s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 40%;
    height: 40%;
    top: 30%;
    left: 30%;
    animation-duration: 10s;
}

.core-device {
    position: absolute;
    width: 60px;
    height: 60px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

@keyframes orbit-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        margin-top: var(--spacing-xl);
    }

    .hero-book-cover {
        max-width: 180px;
    }

    .hero-graphic {
        width: 200px;
        height: 200px;
    }
}

/* ================================
   Value Proposition
   ================================ */
.value-prop {
    background-color: var(--color-bg-alt);
}

.value-prop h2 {
    text-align: center;
}

.value-prop .section-intro {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.value-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.value-card:hover {
    box-shadow: var(--shadow-md);
}

.value-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.value-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.value-card h3 {
    margin-bottom: var(--spacing-sm);
}

.value-card p {
    color: var(--color-text-light);
}

/* ================================
   Tools Section
   ================================ */
.tools-section {
    background-color: var(--color-bg);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.tool-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.tool-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.tool-card-disabled {
    opacity: 0.45;
    pointer-events: none;
    user-select: none;
}

.tool-card-disabled:hover {
    border-color: var(--color-border);
    box-shadow: none;
}

.tool-header {
    margin-bottom: var(--spacing-md);
}

.tool-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-bg-alt);
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.tool-card h3 {
    font-size: var(--font-size-lg);
}

.tool-card > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.tool-preview {
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Risk Meter */
.risk-meter {
    height: 8px;
    background-color: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.risk-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-success), var(--color-warning), var(--color-danger));
    border-radius: 4px;
    transition: width var(--transition-slow);
}

.risk-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Score Grid */
.score-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.score-item {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
}

.score {
    font-weight: 600;
    color: var(--color-primary);
}

/* Chart Placeholder */
.chart-placeholder {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--spacing-xl);
    height: 60px;
}

.bar {
    width: 40px;
    border-radius: 4px 4px 0 0;
    transition: height var(--transition-slow);
}

.bar-hw {
    background: linear-gradient(180deg, var(--color-text-light) 0%, var(--color-secondary) 100%);
}

.bar-sw {
    background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
}

/* Checklist Preview */
.checklist-preview {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.check-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.check-item::before {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    flex-shrink: 0;
}

.check-item.checked {
    color: var(--color-text);
}

.check-item.checked::before {
    background-color: var(--color-success);
    border-color: var(--color-success);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-size: 12px;
    background-position: center;
    background-repeat: no-repeat;
}

.tools-cta {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.tools-cta p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

/* ================================
   Digest Section
   ================================ */
.digest-section {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1e3a5f 100%);
    color: white;
}

.digest-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

@media (max-width: 868px) {
    .digest-content {
        grid-template-columns: 1fr;
    }
}

.digest-info h2 {
    color: white;
}

.digest-info .section-intro {
    color: rgba(255, 255, 255, 0.8);
}

.digest-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.digest-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: rgba(255, 255, 255, 0.9);
}

.digest-features svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
}

/* Signup Form */
.digest-signup {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
}

.signup-form h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: white;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--spacing-md);
}

/* Digest Archive */
.digest-archive h3 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.archive-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.archive-item {
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.archive-item:hover {
    background: rgba(255, 255, 255, 0.15);
}

.issue-date {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-xs);
}

.issue-title {
    color: white;
    font-weight: 500;
}

.archive-link {
    color: var(--color-primary-light);
    font-weight: 500;
}

/* ================================
   Book Section
   ================================ */
.book-section {
    background-color: var(--color-bg-alt);
}

.book-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

@media (max-width: 868px) {
    .book-content {
        grid-template-columns: 1fr;
    }
}

.book-cover-img {
    width: 100%;
    max-width: 300px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

.book-info h2 {
    margin-bottom: var(--spacing-sm);
}

.book-info h3 {
    color: var(--color-text-light);
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
}

.book-info > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.book-highlights {
    margin-bottom: var(--spacing-lg);
}

.book-highlights li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.book-highlights strong {
    color: var(--color-text);
}

.book-detail {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.book-audience {
    font-style: italic;
    color: var(--color-text-muted);
}

.book-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
}

/* ================================
   Chapters Section
   ================================ */
.chapters-section {
    background-color: var(--color-bg);
}

.arc-group {
    margin-bottom: var(--spacing-2xl);
}

.arc-group:last-child {
    margin-bottom: 0;
}

.arc-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.arc-label {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 4px;
    white-space: nowrap;
}

.arc-header h3 {
    font-size: var(--font-size-lg);
    color: var(--color-text);
    margin: 0;
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
}

.chapter-card {
    display: block;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    text-decoration: none;
}

.chapter-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.chapter-num {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.chapter-card h4 {
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.4;
}

/* ================================
   About Section
   ================================ */
.about-section {
    background-color: var(--color-bg-alt);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

@media (max-width: 868px) {
    .about-content {
        grid-template-columns: 1fr;
    }
}

.about-text h3 {
    margin-bottom: var(--spacing-xs);
}

.about-role {
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.about-text p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.about-links {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 500;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link:hover {
    color: var(--color-primary);
}

/* Services */
.about-services h3 {
    margin-bottom: var(--spacing-lg);
}

.service-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.service-card h4 {
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* ================================
   Footer
   ================================ */
.footer {
    background-color: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

@media (max-width: 500px) {
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
}

.footer-col h4 {
    color: white;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-xl);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: var(--font-size-sm);
}

/* ================================
   Utility Classes
   ================================ */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* Scroll padding for fixed nav */
html {
    scroll-padding-top: 80px;
}