/* CSS Variables for theming */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --bg-input: #0a0a0a;
    --border-color: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent-color: #3EB489;
    --navbar-bg: #0a0a0a;
}

[data-theme="light"] {
    --bg-primary: #F5EFE3;
    --bg-secondary: #F5EFE3;
    --bg-card: #FDFAF5;
    --bg-input: #ffffff;
    --border-color: #D4C9B0;
    --text-primary: #1a1a1a;
    --text-secondary: rgba(0, 0, 0, 0.7);
    --text-muted: rgba(0, 0, 0, 0.5);
    --accent-color: #355E3B;
    --navbar-bg: #F5EFE3;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: var(--navbar-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

[data-theme="light"] .navbar {
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: background 0.2s;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

.theme-icon-sun {
    display: none;
}

.theme-icon-moon {
    display: block;
}

[data-theme="light"] .theme-icon-sun {
    display: block;
}

[data-theme="light"] .theme-icon-moon {
    display: none;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-logo {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.nav-brand-text {
    font-weight: 600;
}

.nav-user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 24px;
    transition: background 0.2s;
}

.nav-user-profile:hover {
    background: var(--bg-secondary);
}

.nav-user-name {
    font-size: 14px;
    font-weight: 500;
}

.nav-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-color);
}

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

/* Hamburger menu button */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 110;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.hamburger-open .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger-open .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-open .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: all 0.2s;
}

.btn-primary {
    background: #3EB489;
    color: #0a0a0a;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-1px);
    background: #52C49A;
    box-shadow: 0 4px 12px rgba(139, 195, 74, 0.4);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-icon {
    padding: 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
}

.btn-icon:hover {
    background: var(--bg-secondary);
}

/* Hero Section - Fullscreen */
.hero-fullscreen {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: left;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    /* Placeholder gradient when no image is set */
    background-color: #1a2f1a;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.6) 0%,
        rgba(0, 0, 0, 0.5) 40%,
        rgba(0, 0, 0, 0.7) 100%
    );
}

.hero-content-centered {
    position: relative;
    z-index: 10;
    max-width: 860px;
    padding: 80px 20px;
}

.hero-headline {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.1;
    color: var(--accent-color);
}

.hero-tagline {
    font-size: 18px;
    font-weight: 300;
    opacity: 0.9;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
    letter-spacing: 0.3px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 32px;
}

.btn-accent {
    background: #3EB489;
    color: #1a2f1a;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 2px solid #3EB489;
}

.btn-accent:hover {
    background: #52C49A;
    border-color: #52C49A;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 195, 74, 0.4);
}

.btn-outline-light {
    background: transparent;
    color: white;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 2px solid white;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.hero-auth {
    margin-top: 40px;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    color: var(--text-primary);
    opacity: 0.7;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.user-welcome {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.user-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 3px solid white;
}

.user-info {
    text-align: left;
}

.welcome-text {
    font-size: 14px;
    opacity: 0.8;
}

.user-name {
    font-size: 24px;
    font-weight: 600;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Legacy hero styles (kept for compatibility) */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.hero-note {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 12px;
}

.hero-actions .btn-primary {
    background: white;
    color: #667eea;
}

.hero-actions .btn-secondary {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
}

/* About Section */
.about-section {
    padding: 80px 20px;
    background: var(--bg-primary);
}

.about-container {
    max-width: 900px;
    margin: 0 auto;
}

.about-accent-bar {
    width: 80px;
    height: 4px;
    background: #3EB489;
    margin-bottom: 32px;
}

.about-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 32px;
    line-height: 1.2;
}

.about-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.about-text:last-child {
    margin-bottom: 0;
}

/* Get DingDuff Section */
.get-dingduff-section {
    padding: 80px 20px;
    background: var(--bg-secondary);
}

.get-dingduff-container {
    max-width: 1100px;
    margin: 0 auto;
}

.get-dingduff-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 16px;
    line-height: 1.2;
}

.get-dingduff-intro {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 64px;
    line-height: 1.7;
}

.get-dingduff-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 80px;
}

.get-dingduff-block:last-child {
    margin-bottom: 0;
}

.get-dingduff-block-reverse .get-dingduff-image {
    order: -1;
}

.get-dingduff-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.2;
}

.get-dingduff-text p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.get-dingduff-image-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
}

.get-dingduff-image img {
    width: 100%;
    border-radius: 12px;
    display: block;
}

.step-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 10px;
}

/* Steps 1–3 overview */
.get-dingduff-steps {
    display: flex;
    gap: 48px;
    align-items: flex-start;
    margin-bottom: 72px;
}

.get-dingduff-step-card {
    flex: 1;
    border-top: 2px solid var(--accent-color);
    padding-top: 28px;
    display: flex;
    flex-direction: column;
}

.step-num {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 14px;
}

.get-dingduff-step-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.3;
}

.get-dingduff-step-card p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
    flex: 1;
}

.get-dingduff-btn {
    margin-top: 20px;
    display: inline-block;
    align-self: flex-start;
}

@media (max-width: 768px) {
    .get-dingduff-steps {
        flex-direction: column;
        gap: 32px;
    }

    .get-dingduff-step-card {
        border-top: none;
        border-left: 2px solid var(--accent-color);
        padding-top: 0;
        padding-left: 24px;
    }
}

/* Step 2 detailed sub-steps */
.get-dingduff-step2 {
    border-left: 3px solid var(--accent-color);
    padding-left: 32px;
    margin-bottom: 80px;
}

.get-dingduff-step2 > h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.2;
}

.step2-intro {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.substep-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.substep-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.substep-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-color);
    color: #1a2f1a;
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.substep-item p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin: 0;
    padding-top: 4px;
}

.get-dingduff-substep-block {
    margin-bottom: 40px;
}

.get-dingduff-substep-block .get-dingduff-text {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.get-dingduff-substep-block .get-dingduff-text p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 0;
}

.get-dingduff-substep-block .get-dingduff-image img {
    width: 100%;
    border-radius: 12px;
    display: block;
    border: 1px solid var(--border-color);
}

.get-dingduff-result {
    margin-top: 40px;
}

.get-dingduff-result > p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.get-dingduff-result-image {
    max-width: 700px;
    width: 100%;
    border-radius: 12px;
    display: block;
    margin: 0 auto;
}

/* Step 3 top spacing */
.get-dingduff-step3 {
    margin-top: 0;
}

@media (max-width: 768px) {
    .get-dingduff-block,
    .get-dingduff-block-reverse {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-bottom: 56px;
    }

    .get-dingduff-step2 {
        padding-left: 20px;
    }
}

/* Hero Video Section */
.hero-video-section {
    padding: 60px 20px;
    background: var(--bg-primary);
}

.hero-video-container {
    max-width: 860px;
    margin: 0 auto;
}

.hero-video-link {
    text-align: center;
    margin-top: 12px;
    font-size: 0.9rem;
}

.hero-video-link a {
    color: var(--text-secondary);
    text-decoration: none;
}

.hero-video-link a:hover {
    color: var(--accent-primary);
}

/* Who Is DingDuff For Section */
.who-section {
    padding: 80px 20px;
    background: var(--bg-primary);
}

/* How it Works Section */
.how-it-works {
    padding: 80px 20px;
    background: var(--bg-secondary);
}

.how-it-works-container {
    max-width: 900px;
    margin: 0 auto;
}

.how-it-works-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 32px;
}

.how-it-works-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.how-it-works-screenshot {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 48px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    min-height: 200px;
}

.how-it-works-screenshot img {
    width: 100%;
    display: block;
}

.how-it-works-screenshot--crop-bottom {
    min-height: 0;
    aspect-ratio: 1830 / 248;
    overflow: hidden;
}

.how-it-works-screenshot--crop-bottom img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.skill-download-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.4px;
    border: 1.5px solid var(--accent-color);
    border-radius: 6px;
    padding: 8px 18px;
    margin-bottom: 32px;
    transition: background 0.2s, color 0.2s;
}

.skill-download-link:hover {
    background: var(--accent-color);
    color: var(--bg-primary);
}

.how-it-works-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 48px;
}

@media (max-width: 768px) {
    .how-it-works-two-col {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.how-it-works-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    margin-top: 16px;
    background: var(--bg-card);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.how-it-works-video iframe,
.how-it-works-video video {
    width: 100%;
    height: 100%;
    display: block;
}

/* Full Width Image Section */
.full-width-image {
    width: 100%;
    height: 400px;
    position: relative;
}

.full-width-image-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: bottom;
    filter: grayscale(100%);
}

/* Opportunity Section */
.opportunity-section {
    padding: 80px 20px;
    background: var(--bg-primary);
}

.opportunity-container {
    max-width: 900px;
    margin: 0 auto;
}

.opportunity-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 40px;
    line-height: 1.2;
}

/* Accordion */
.accordion {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--border-color);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    width: 100%;
    padding: 20px 24px;
    background: var(--bg-card);
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-primary);
    transition: background 0.2s;
}

.accordion-header:hover {
    background: var(--bg-secondary);
}

.accordion-icon {
    font-size: 20px;
    color: var(--text-muted);
    transition: transform 0.3s;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    background: var(--bg-card);
    transition: max-height 0.3s ease-out;
}

.accordion-open .accordion-content {
    max-height: 300px;
}

.accordion-open .accordion-icon {
    transform: rotate(45deg);
}

.accordion-content ul {
    padding: 0 24px 24px 48px;
    list-style: disc;
    color: var(--text-secondary);
}

.accordion-content li {
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 8px;
}

/* Skills Section */
.skills-section {
    padding: 80px 20px;
    background: var(--bg-primary);
    text-align: center;
}

.skills-container {
    max-width: 800px;
    margin: 0 auto;
}

.applications-accent-bar {
    width: 80px;
    height: 4px;
    background: #3EB489;
    margin: 0 auto 32px;
}

.skills-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 24px;
}

.skills-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.skills-image {
    margin-top: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.skills-image img {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    display: block;
    border-radius: 12px;
}

/* Preferences Section */
.preferences-section {
    padding: 80px 20px;
    background: var(--bg-secondary);
}

.preferences-container {
    max-width: 900px;
    margin: 0 auto;
}

.preferences-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 40px;
    line-height: 1.2;
}

.preferences-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.preferences-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.preferences-image {
    width: 100%;
}

.preferences-image img {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    border-radius: 12px;
    display: block;
    border: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .preferences-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
}

.video-placeholder {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 60px 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.video-title {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 24px;
}

.video-play-btn {
    color: #3EB489;
    cursor: pointer;
    transition: transform 0.2s;
}

.video-play-btn:hover {
    transform: scale(1.1);
}

/* Team Section */
.team-section {
    padding: 80px 20px;
    background: var(--bg-primary);
}

.team-container {
    max-width: 900px;
    margin: 0 auto;
}

.team-section .applications-accent-bar {
    margin: 0 0 32px;
}

.team-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 24px;
}

.team-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 48px;
    text-align: left;
}

/* Team Accordion */
.team-accordion {
    text-align: left;
}

.team-accordion-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 16px;
    overflow: hidden;
}

.team-accordion-header {
    width: 100%;
    padding: 20px 24px;
    background: transparent;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    color: var(--accent-color);
    transition: background 0.2s;
}

.team-accordion-header:hover {
    background: var(--bg-secondary);
}

.team-accordion-icon {
    font-size: 24px;
    color: var(--text-muted);
}

.team-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.team-accordion-open .team-accordion-content {
    max-height: 500px;
}

.team-accordion-content p {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
    margin: 0;
}

.team-accordion-content p:first-child {
    padding-top: 0;
}

/* Contact Form Section */
.contact-section {
    padding: 80px 20px;
    background: var(--bg-secondary);
    text-align: center;
}

.contact-container {
    max-width: 700px;
    margin: 0 auto;
}

.contact-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.contact-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.contact-form {
    text-align: left;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 600px) {
    .contact-form .form-row {
        grid-template-columns: 1fr;
    }
}

.contact-form .form-group {
    margin-bottom: 24px;
}

.contact-form .form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.contact-form .form-input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form .form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(139, 195, 74, 0.15);
}

.contact-form .form-input::placeholder {
    color: var(--text-muted);
}

.contact-form .form-textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-form .btn {
    width: 100%;
    padding: 16px 32px;
    font-size: 16px;
}

/* Features Section */
.features {
    padding: 80px 20px;
    background: var(--bg-primary);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 48px;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 540px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}

.feature-icon {
    color: var(--accent-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 300;
    line-height: 1.6;
}

/* Integration Section */
.integration {
    padding: 80px 20px;
    background: var(--bg-secondary);
    text-align: center;
}

.integration-container {
    max-width: 800px;
    margin: 0 auto;
}

.integration h2 {
    font-size: 32px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.integration > p {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 300;
}

.integration-logos {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.integration-item {
    background: var(--bg-card);
    padding: 24px 32px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.integration-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* Profile Page */
.profile-section {
    padding: 40px 20px;
    flex: 1;
    background: var(--bg-primary);
}

.profile-container {
    max-width: 800px;
    margin: 0 auto;
}

.loading-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.not-logged-in {
    text-align: center;
    padding: 80px 20px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.not-logged-in h2 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.not-logged-in p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.profile-header {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 32px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.profile-avatar {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    border: 4px solid var(--accent-color);
}

.profile-info h1 {
    font-size: 28px;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.profile-email {
    color: var(--text-secondary);
    font-size: 16px;
}

.profile-details {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.profile-details h2 {
    font-size: 20px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.detail-item label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-item span {
    font-size: 16px;
    color: var(--text-primary);
}

/* Token Section */
.token-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.token-section h2 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.token-description {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.token-box {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.token-box label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.token-input-group {
    display: flex;
    gap: 8px;
}

.token-input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 14px;
    background: var(--bg-card);
    color: var(--text-primary);
}

.copy-feedback {
    color: #48bb78;
    font-size: 14px;
    margin-top: 8px;
}

.config-example {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.config-example h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.config-example p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.config-example code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--accent-color);
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
}

.code-block {
    background: #2d3748;
    color: #e2e8f0;
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 13px;
    margin-bottom: 16px;
    white-space: pre;
}

.profile-actions {
    text-align: center;
}

.error {
    color: #e53e3e;
}

/* Profile Avatar Container */
.profile-avatar-container {
    position: relative;
    display: inline-block;
}

.avatar-edit-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    background: var(--bg-card);
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    padding: 6px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
}

.avatar-edit-btn:hover {
    background: var(--accent-color);
    color: var(--bg-primary);
}

.avatar-edit-btn svg {
    display: block;
}

/* Profile Edit Section */
.profile-edit-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.profile-edit-section h2 {
    font-size: 20px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.profile-form {
    max-width: 500px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--bg-input);
    color: var(--text-primary);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(139, 195, 74, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.picture-input-group {
    display: flex;
    gap: 8px;
}

.picture-input-group .form-input {
    flex: 1;
}

.btn-upload {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    white-space: nowrap;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-upload:hover {
    background: var(--border-color);
}

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 24px;
}

.save-feedback {
    font-size: 14px;
    font-weight: 500;
}

.save-feedback-success {
    color: #48bb78;
}

.save-feedback-error {
    color: #e53e3e;
}

.save-feedback-info {
    color: #4299e1;
}

/* Security Section */
.profile-security-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.profile-security-section h2 {
    font-size: 20px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.security-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.security-item:last-child {
    border-bottom: none;
}

.security-info h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.security-info p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.security-note {
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-left: 8px;
}

.badge-success {
    background: #c6f6d5;
    color: #276749;
}

.badge-warning {
    background: #feebc8;
    color: #c05621;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    color: var(--text-muted);
    padding: 24px 20px;
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    font-size: 14px;
}

/* Responsive */
@media (max-width: 1050px) {
    .nav-hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--navbar-bg);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links.nav-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links .nav-link {
        padding: 16px 0;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        text-align: center;
    }

    .nav-links .nav-link:last-of-type {
        border-bottom: none;
    }

    .nav-user-profile {
        padding: 16px 0;
        justify-content: center;
    }

    #auth-nav {
        width: 100%;
        display: flex;
        justify-content: center;
        padding-top: 16px;
    }
}

@media (max-width: 768px) {
    .hero-headline {
        font-size: 36px;
    }

    .hero-tagline {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }


    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .user-welcome {
        flex-direction: column;
    }

    .hero-actions {
        flex-direction: column;
    }
}

/* Light mode general overrides */

[data-theme="light"] .code-block {
    background: #2C2416;
    color: #F5EFE3;
}


[data-theme="light"] .footer {
    background: var(--bg-primary);
    border-top-color: var(--border-color);
}

/* Light mode overrides for hardcoded greens */
[data-theme="light"] .btn-primary {
    background: #355E3B;
    color: #ffffff;
}

[data-theme="light"] .btn-primary:hover {
    background: #2D5233;
    box-shadow: 0 4px 12px rgba(53, 94, 59, 0.3);
}

[data-theme="light"] .btn-accent {
    background: #355E3B;
    color: #ffffff;
    border-color: #355E3B;
}

[data-theme="light"] .btn-accent:hover {
    background: #2D5233;
    border-color: #2D5233;
    box-shadow: 0 4px 12px rgba(53, 94, 59, 0.3);
}

[data-theme="light"] .about-accent-bar,
[data-theme="light"] .applications-accent-bar {
    background: #355E3B;
}

[data-theme="light"] .video-play-btn {
    color: #355E3B;
}

[data-theme="light"] .substep-number {
    background: #355E3B;
    color: #ffffff;
}

[data-theme="light"] .get-dingduff-step-card {
    border-top-color: #355E3B;
}

[data-theme="light"] .get-dingduff-step2 {
    border-left-color: #355E3B;
}