@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success: #10b981;
    --success-light: #d1fae5;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-input: #0f172a;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInDown 0.6s ease-out;
}

.header__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.header__title {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

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

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease-out;
}

.form-section {
    margin-bottom: 24px;
}

.form-section__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Mobile Responsive */
@media (max-width: 600px) {
    .container {
        padding: 24px 16px 60px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: 20px;
        border-radius: 16px;
    }
    
    .header__title {
        font-size: clamp(24px, 7vw, 40px);
    }
    
    .header__subtitle {
        font-size: 14px;
    }
    
    .upload-area {
        padding: 32px 20px;
    }
    
    .upload-area__icon {
        width: 48px;
        height: 48px;
    }
    
    .upload-area__title {
        font-size: 16px;
    }
    
    .result-card__actions {
        flex-direction: column;
    }
    
    .result-card__actions .btn {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .feature-card {
        padding: 16px;
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
}

/* Extra Small Screens */
@media (max-width: 380px) {
    .container {
        padding: 16px 12px 48px;
    }
    
    .card {
        padding: 16px;
    }
    
    .header__badge {
        font-size: 10px;
        padding: 4px 10px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .features-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    .feature-card {
        padding: 12px;
    }
    
    .feature-card__icon {
        width: 40px;
        height: 40px;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .upload-area {
        padding: 40px 24px;
    }
    
    .btn {
        min-height: 48px;
    }
    
    .form-select {
        min-height: 48px;
    }
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-select {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.form-select:hover {
    border-color: var(--text-muted);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

.upload-area {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(15, 23, 42, 0.5);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.01);
}

.upload-area.has-file {
    border-style: solid;
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
}

.upload-area__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.upload-area:hover .upload-area__icon {
    color: var(--primary);
    transform: translateY(-4px);
}

.upload-area__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-area__subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.upload-area__hint {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: 9999px;
    font-size: 12px;
    color: var(--text-muted);
}

.upload-area__input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.preview-container {
    display: none;
    position: relative;
}

.preview-container.visible {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.preview-image {
    max-width: 200px;
    max-height: 200px;
    border-radius: 12px;
    object-fit: contain;
    border: 1px solid var(--border-color);
}

.preview-info {
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.preview-remove {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 28px;
    height: 28px;
    background: var(--danger);
    border: 2px solid var(--bg-card);
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    opacity: 0;
}

.preview-container:hover .preview-remove {
    opacity: 1;
}

.preview-remove:hover {
    transform: scale(1.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
    width: 100%;
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

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

.btn--secondary:hover {
    background: #273548;
}

.btn--success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

.btn--success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.alert {
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 14px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-top: 24px;
    animation: shakeIn 0.5s ease-out;
}

.alert svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.alert--error {
    background: var(--danger-light);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert--success {
    background: var(--success-light);
    color: #065f46;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.result-card {
    margin-top: 24px;
    padding: 24px;
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-lg);
    animation: slideUp 0.4s ease-out;
}

.result-card__header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.result-card__icon {
    width: 48px;
    height: 48px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.result-card__title {
    font-size: 18px;
    font-weight: 700;
    color: var(--success);
}

.result-card__message {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
}

.result-card__actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.suggest-card {
    margin-top: 16px;
    padding: 20px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    animation: slideUp 0.4s ease-out 0.1s both;
}

.suggest-card__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 12px;
}

.suggest-card__text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.visible {
    display: flex;
}

.loading-spinner__icon {
    width: 64px;
    height: 64px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner__text {
    font-size: 16px;
    font-weight: 500;
    margin-top: 20px;
}

.loading-spinner__subtext {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-top: 40px;
}

.feature-card {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.feature-card__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    background: rgba(99, 102, 241, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.feature-card__title {
    font-size: 14px;
    font-weight: 600;
}

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

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 40px;
}

.requirement-card {
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.requirement-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.requirement-card__exam {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

.requirement-card__spec {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.requirement-card__badge {
    display: inline-block;
    padding: 4px 8px;
    background: var(--primary);
    border-radius: 9999px;
    font-size: 10px;
    font-weight: 600;
    color: white;
    text-transform: uppercase;
    margin-bottom: 8px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shakeIn {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

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