* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --teal-600: #0d9488;
    --teal-50: #f0fdfa;
    --teal-100: #ccfbf1;
    --teal-200: #99f6e4;
    --teal-300: #5eead4;
    --white: #ffffff;
    --black: #000000;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
}

body {
    font-family: 'Noto Sans TC', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--white);
    color: var(--gray-900);
    line-height: 1.6;
}

/* Navigation Bar */
.navbar {
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--teal-600);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--teal-600);
    border-bottom-color: var(--teal-600);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--white) 0%, var(--teal-50) 50%, var(--white) 100%);
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
}

.hero-content {
    margin-bottom: 3rem;
}

.hero-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--teal-600);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-title .highlight {
    color: var(--teal-600);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--gray-700);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.65rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    border-color: var(--teal-300);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.1);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--teal-600);
}

/* Section Title */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 2.5rem;
    text-align: center;
}

/* PSR Section */
.psr-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.psr-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.psr-card {
    background: var(--gray-50);
    border-radius: 0.65rem;
    padding: 2rem;
    border-left: 4px solid var(--teal-600);
}

.psr-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.psr-icon {
    font-size: 1.5rem;
}

.psr-header h3 {
    font-size: 1.3rem;
    color: var(--gray-900);
}

.psr-list {
    list-style: none;
    space-y: 0.75rem;
}

.psr-list li {
    color: var(--gray-700);
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
}

.psr-list li:before {
    content: "•";
    color: var(--teal-600);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Team Section */
.team-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.team-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.65rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.team-card:hover {
    border-color: var(--teal-300);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.1);
}

.team-avatar {
    width: 50px;
    height: 50px;
    background: var(--teal-600);
    color: var(--white);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0 auto 1rem;
}

.team-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.team-role {
    font-size: 0.9rem;
    color: var(--teal-600);
    font-weight: 600;
    margin-bottom: 1rem;
}

.team-tasks {
    list-style: none;
    font-size: 0.85rem;
    color: var(--gray-600);
    text-align: left;
}

.team-tasks li {
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
}

.team-tasks li:before {
    content: "•";
    color: var(--teal-600);
    position: absolute;
    left: 0;
}

/* Data Source Section */
.datasource-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.datasource-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.datasource-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.65rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.datasource-card:hover {
    border-color: var(--teal-300);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.1);
}

.datasource-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 1rem;
}

.datasource-card p {
    font-weight: 500;
    color: var(--gray-900);
}

/* Features Section */
.features-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--gray-50);
    border-radius: 0.65rem;
    padding: 2rem;
    border: 1px solid var(--gray-200);
}

.feature-card h3 {
    font-size: 1.2rem;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--gray-700);
    line-height: 1.6;
}

/* Model Section */
.model-section {
    padding: 4rem 0;
}

.model-subsection {
    margin-bottom: 3rem;
}

.model-subsection h3 {
    font-size: 1.3rem;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.model-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.metric-item {
    background: var(--gray-50);
    border-radius: 0.65rem;
    padding: 2rem;
    text-align: center;
}

.metric-label {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--teal-600);
    margin-bottom: 0.5rem;
}

.metric-desc {
    font-size: 0.85rem;
    color: var(--gray-600);
}

.feature-list,
.limitation-list {
    list-style: none;
}

.feature-list li,
.limitation-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
    line-height: 1.6;
}

.feature-list li:before,
.limitation-list li:before {
    content: "•";
    color: var(--teal-600);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.85rem;
    }

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

    .stats-grid,
    .psr-grid,
    .team-grid,
    .datasource-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

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

    .model-metrics {
        grid-template-columns: 1fr;
    }
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    font-size: 0.95rem;
    color: var(--gray-900);
    background-color: var(--white);
    font-family: inherit;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--teal-600);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--teal-600);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #0f766e;
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.btn-primary:disabled {
    background-color: var(--gray-400);
    cursor: not-allowed;
}

/* Result Card */
.result-card {
    background: var(--teal-50);
    border: 1px solid var(--teal-200);
    border-radius: 0.65rem;
    padding: 2rem;
}

.result-item {
    background: var(--white);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--gray-200);
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-label {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--teal-600);
    margin-bottom: 0.25rem;
}

.result-unit {
    font-size: 0.85rem;
    color: var(--gray-600);
}