/* =========================================
   1. Bootstrap & Variables (from Bolt)
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Bolt Colors */
    --color-primary: #2563eb;
    --color-primary-light: #dbeafe;
    --color-primary-dark: #1e40af;
    --color-secondary: #16a34a;
    --color-secondary-light: #dcfce7;
    --color-secondary-dark: #15803d;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-white: #ffffff;
    --transition: all 0.3s ease;

    /* Mappings for Gemini3 Compatibility */
    --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-body);
}

body {
    background-color: var(--color-white);
    color: var(--color-gray-700);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    /* Matched typical container width */
    margin: 0 auto;
    padding: 0 1rem;
}

/* Typography Shared */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--color-gray-900);
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    text-align: center;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--color-gray-600);
}

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

ul {
    list-style: none;
}

/* Utilities */
.text-center {
    text-align: center;
}

.sp-only {
    display: none;
}

@media (max-width: 768px) {
    .sp-only {
        display: inline;
    }
}

.bg-gray-50 {
    background-color: var(--color-gray-50);
}

.bg-white {
    background-color: var(--color-white);
}

/* =========================================
   2. Components (Buttons, Gradients)
   ========================================= */
.btn {
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-transform: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.2);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-200);
}

.btn-secondary:hover {
    background-color: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

.btn-outline {
    /* Keeping Gemini3 naming but styling like Secondary */
    background-color: transparent;
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-200);
    padding: 0.8rem 2rem;
    /* Adjusted to match btn padding roughly */
    border-radius: 0.75rem;
}

.btn-outline:hover {
    background-color: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================
   3. Header (New for Light Theme)
   ========================================= */
.header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-gray-900);
    /* Optional: gradient logo to match Hero */
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--color-gray-600);
    font-weight: 500;
    font-size: 0.95rem;
}

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

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    /* Simplified mobile handling for now */
}


/* =========================================
   4. Hero Section
   ========================================= */
.hero {
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
    padding: 6rem 1rem 3rem;
    /* Added top padding for fixed header */
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-block;
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: none;
    /* Override Gemini3 border */
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.4;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    max-width: 48rem;
    margin: 0 auto 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* =========================================
   5. Sections & Cards
   ========================================= */
section {
    padding: 3rem 0;
}

.section-header {
    margin-bottom: 2rem;
    text-align: center;
}

.section-subtitle {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.25rem;
    color: var(--color-gray-900);
}

/* Problem Section */
.problem {
    background-color: var(--color-white);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.problem-card {
    padding: 2rem;
    border-radius: 1.5rem;
    background: linear-gradient(135deg, #f9fafb 0%, var(--color-white) 100%);
    border: 1px solid var(--color-gray-200);
    transition: var(--transition);
    text-align: center;
}

.problem-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Features Section */
.features {
    background-color: var(--color-white);
}

.feature-list {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(3, 1fr);
    /* Force 3 columns for desktop */
}

@media (max-width: 900px) {
    .feature-list {
        grid-template-columns: 1fr;
    }
}

.feature-item {
    background-color: var(--color-white);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid var(--color-gray-200);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.feature-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary-light);
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.feature-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--color-gray-900);
}

/* Curriculum Section */
.curriculum {
    background-color: var(--color-gray-50);
}

.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Reuse specific styling for cards */
.curriculum-card {
    background-color: var(--color-white);
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    border: 1px solid var(--color-gray-100);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.curriculum-card:hover {
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.card-header {
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    padding: 1.5rem;
    border-bottom: 1px solid var(--color-gray-100);
}

/* Special headers matching Bolt's color usage */
.curriculum-card:nth-child(1) .card-header .day-badge {
    background-color: var(--color-primary);
}

.curriculum-card:nth-child(2) .card-header .day-badge {
    background-color: var(--color-secondary);
}

.curriculum-card:nth-child(3) .card-header .day-badge {
    background-color: #8b5cf6;
    /* Added purple for 3rd item variation */
}

.day-badge {
    display: inline-block;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.card-header h3 {
    font-size: 1.25rem;
    margin: 0;
}

.card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.curriculum-list {
    margin-bottom: 0.5rem;
    flex-grow: 1;
}

.curriculum-list li {
    margin-bottom: 0.75rem;
    padding-left: 1.25rem;
    position: relative;
    color: var(--color-gray-700);
    font-size: 0.95rem;
}

.curriculum-list li::before {
    content: "•";
    color: var(--color-primary);
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.2em;
    line-height: 1;
}

.use-case h4 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.use-case p {
    font-size: 0.9rem;
    color: var(--color-gray-700);
    margin-bottom: 0;
    line-height: 1.5;
}

.workflow-arrow {
    text-align: center;
    padding: 0;
    margin: -0.25rem 0;
    color: var(--color-primary);
    opacity: 0.5;
    font-size: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
}

.use-case {
    background-color: #f8fafc;
    /* Slate 50 */
    border: 1px solid var(--color-primary-light);
    padding: 1.25rem;
    border-radius: 1rem;
    position: relative;
    margin-top: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.use-case::before {
    /* Optional: Label tag */
    content: "GOAL";
    position: absolute;
    top: -0.75rem;
    left: 1.5rem;
    background: var(--color-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 0.2rem 0.6rem;
    border-radius: 1rem;
    letter-spacing: 0.05em;
}

.use-case strong {
    font-weight: 800;
    font-size: 1.15em;
    background: linear-gradient(transparent 60%, rgba(37, 99, 235, 0.1) 60%);
}

/* GOAL Grid Layout */
.use-case-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.use-case-item {
    background: linear-gradient(135deg, #f0f9ff 0%, #f8fafc 100%);
    border: 1px solid var(--color-primary-light);
    border-radius: 0.75rem;
    padding: 1rem 1rem 1rem 2.5rem;
    position: relative;
    transition: var(--transition);
}

.use-case-item::before {
    content: "✓";
    position: absolute;
    left: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-primary);
    font-weight: 800;
    font-size: 1rem;
}

.use-case-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.use-case-item p {
    font-size: 0.95rem;
    color: var(--color-gray-700);
    margin-bottom: 0;
    line-height: 1.7;
}

.use-case-item strong {
    font-weight: 800;
    font-size: 1.05em;
    background: linear-gradient(transparent 60%, rgba(37, 99, 235, 0.15) 60%);
}

/* 詳細ボタン */
.btn-detail {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-detail:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

.curriculum-card:nth-child(2) .btn-detail {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #22c55e 100%);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.25);
}

.curriculum-card:nth-child(2) .btn-detail:hover {
    background: linear-gradient(135deg, var(--color-secondary-dark) 0%, var(--color-secondary) 100%);
    box-shadow: 0 8px 20px rgba(22, 163, 74, 0.35);
}

.curriculum-card:nth-child(3) .btn-detail {
    background: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 100%);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.25);
}

.curriculum-card:nth-child(3) .btn-detail:hover {
    background: linear-gradient(135deg, #7c3aed 0%, #8b5cf6 100%);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.35);
}


/* Instructor Section */
.instructor {
    background-color: var(--color-gray-50);
}

.instructor-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
    background: var(--color-white);
    padding: 3rem;
    border-radius: 1.5rem;
    border: 1px solid var(--color-gray-200);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

.instructor-image {
    aspect-ratio: 1;
    background-color: var(--color-gray-200);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.instructor-name {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
}

.org {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-gray-600);
}

.instructor-desc {
    color: var(--color-gray-600);
    font-size: 1rem;
}


/* CTA Section */
.cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    padding: 3rem 1rem;
    color: var(--color-white);
    position: relative;
    text-align: center;
}

.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.cta h2 {
    color: var(--color-white);
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta .btn-primary {
    background-color: var(--color-white);
    color: var(--color-primary);
    padding: 1.25rem 3rem;
}

.cta .btn-primary:hover {
    background-color: var(--color-gray-50);
}


/* Footer */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: 3rem 0;
    font-size: 0.875rem;
}


/* Standardizing Gradients for Text - Helper */
.text-gradient-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Mobile Tweaks */
@media (max-width: 768px) {
    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .instructor-wrapper {
        grid-template-columns: 1fr;
        padding: 1.5rem;
        text-align: center;
    }

    .instructor-name {
        justify-content: center;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   6. Course Details Page
   ========================================= */

.page-header {
    background-color: var(--color-gray-50);
    padding: 5rem 1rem 2rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-gray-900);
}

.page-desc {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.detail-section {
    padding: 3rem 0;
    /* border-bottom removed for multi-section layout */
}

.detail-header {
    text-align: center;
    margin-bottom: 2rem;
}

.day-label {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Day specific colors */
.day-1 .day-label {
    background-color: var(--color-primary);
}

.day-2 .day-label {
    background-color: var(--color-secondary);
}

.day-3 .day-label {
    background-color: #8b5cf6;
}

.day-1 h2 {
    color: var(--color-primary-dark);
}

.day-2 h2 {
    color: var(--color-secondary-dark);
}

.day-3 h2 {
    color: #7c3aed;
}

.detail-subtitle {
    font-size: 1.1rem;
    color: var(--color-gray-600);
    font-weight: 500;
}

.detail-content {
    max-width: 900px;
    margin: 0 auto;
}

/* Problem & Solution Box */
.problem-solution {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    background: #fdfdfd;
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid var(--color-gray-200);
}

.problem-box,
.solution-box {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 600px;
}

.problem-box {
    background-color: #fef2f2;
    /* Light Red */
    border: 1px solid #fee2e2;
}

.solution-box {
    background-color: #f0fdf4;
    /* Light Green */
    border: 1px solid #dcfce7;
}

.problem-box .icon,
.solution-box .icon {
    font-size: 2rem;
}

.arrow-down {
    font-size: 2rem;
    color: var(--color-gray-400);
}

/* Visual Flow */
.visual-flow {
    margin-bottom: 2rem;
}

.visual-flow h3,
.outcome-box h3 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.step-card {
    background-color: white;
    border: 1px solid var(--color-gray-200);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    width: 100%;
    height: 100%;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.step-num {
    background-color: var(--color-gray-800);
    color: white;
    padding: 0.2rem 0.8rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--color-gray-400);
}

@media (max-width: 768px) {
    .flow-steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 0.5rem 0;
    }

    .step-card {
        min-height: auto;
    }
}

/* Outcome Box */
.outcome-box {
    background-color: var(--color-primary-light);
    padding: 1.5rem;
    border-radius: 1.5rem;
    border: 1px solid var(--color-primary);
}

.check-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.check-list li {
    background-color: white;
    margin-bottom: 0.75rem;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.check-list li::before {
    content: "✅";
    margin-right: 1rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}