/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #FF8C42;
    --primary-dark: #E67A35;
    --primary-light: #FFA366;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --card-blue: #4A90E2;
    --card-blue-light: #6BA3E8;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.brand-image {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    flex-shrink: 0;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

.language-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    padding: 4px 8px;
    transition: color 0.3s;
    font-family: inherit;
}

.lang-btn:hover,
.lang-btn.active {
    color: var(--primary-color);
    font-weight: 600;
}

.lang-divider {
    color: var(--text-light);
}

/* Main Content */
.main {
    padding: 60px 0;
    min-height: calc(100vh - 100px);
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

/* Left Panel */
.left-panel {
    max-width: 600px;
}

.headline {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.description {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.description-en {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 18px;
    line-height: 1.5;
}

.features-list {
    list-style: none;
    margin-bottom: 50px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    font-size: 18px;
    color: var(--text-primary);
    font-weight: 500;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(255, 140, 66, 0.3);
}

.feature-english {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 6px;
    font-weight: 400;
}

.cta-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 18px 48px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(255, 140, 66, 0.4);
    font-family: inherit;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 140, 66, 0.5);
}

.cta-button:active {
    transform: translateY(0);
}

/* Right Panel - iPhone Mockup */
.right-panel {
    display: flex;
    justify-content: center;
    align-items: center;
}

.iphone-mockup {
    perspective: 1000px;
}

.iphone-frame {
    width: 320px;
    height: 640px;
    background: linear-gradient(145deg, #ffffff 0%, #f5f5f5 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.15),
        0 0 0 2px rgba(0, 0, 0, 0.05),
        inset 0 0 0 1px rgba(255, 255, 255, 0.8);
    position: relative;
    transform: rotateY(-5deg) rotateX(2deg);
    transition: transform 0.3s;
}

.iphone-mockup:hover .iphone-frame {
    transform: rotateY(-3deg) rotateX(1deg);
}

.iphone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 140px;
    height: 28px;
    background: #000;
    border-radius: 0 0 20px 20px;
    z-index: 10;
}

.iphone-screen {
    width: 100%;
    height: 100%;
    background: #ffffff;
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.iphone-status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.status-icons {
    display: flex;
    gap: 6px;
    align-items: center;
    font-size: 12px;
}

.app-content {
    padding: 40px 24px;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.phone-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.app-icon {
    margin-bottom: 32px;
}

.flashcard-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    position: relative;
}

.flashcard-card {
    width: 60px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 8px;
    margin: 0 auto;
    box-shadow: 0 4px 12px rgba(255, 140, 66, 0.3);
    position: relative;
}

.flashcard-card::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    bottom: 8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
}

.app-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.app-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
    padding: 0 10px;
}

.login-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 20px;
    border: 1.5px solid var(--border-color);
    border-radius: 10px;
    background: white;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.login-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-light);
    transform: translateY(-1px);
}

.login-btn svg {
    flex-shrink: 0;
}

.terms-text {
    font-size: 11px;
    color: var(--text-light);
    line-height: 1.5;
}

.terms-text a {
    color: var(--primary-color);
    text-decoration: none;
}

.terms-text a:hover {
    text-decoration: underline;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 40px;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.close-modal {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 32px;
    font-weight: 300;
    color: var(--text-light);
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

.close-modal:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    font-size: 28px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

#notifyForm {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#emailInput {
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s;
}

#emailInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 140, 66, 0.4);
}

/* Footer */
.footer {
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.police-icon {
    width: 16px;
    height: 16px;
    object-fit: contain;
    flex-shrink: 0;
}

.police-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: color 0.3s;
}

.police-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.icp-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: color 0.3s;
}

.icp-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .right-panel {
        order: -1;
    }

    .iphone-frame {
        transform: rotateY(0) rotateX(0);
    }
}

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

    .description {
        font-size: 16px;
    }

    .iphone-frame {
        width: 280px;
        height: 560px;
    }

    .header-content {
        flex-wrap: wrap;
        gap: 16px;
    }

    .nav {
        order: 3;
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .headline {
        font-size: 28px;
    }

    .iphone-frame {
        width: 240px;
        height: 480px;
    }

    .app-title {
        font-size: 22px;
    }

    .app-subtitle {
        font-size: 12px;
    }

    .login-btn {
        font-size: 13px;
        padding: 12px 16px;
    }
}