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

:root {
    --primary-color: hsl(346, 75%, 52%);
    --primary-hover: hsl(346, 75%, 42%);
    --primary-light: hsl(346, 75%, 96%);
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #fafafa;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.05), 0 1px 2px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --radius: 12px;
    --radius-lg: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Header */
header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-lg);
    padding: 1.25rem 2rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

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

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    height: 40px;
    width: auto;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, hsl(346, 75%, 62%) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.username {
    color: var(--text-muted);
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 0;
    margin-top: 1.5rem;
}

.step {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.step:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.step h2 {
    margin-bottom: 1.5rem;
    font-weight: 700;
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, hsl(346, 75%, 62%) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Upload Zone */
.upload-zone {
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: linear-gradient(135deg, var(--primary-light) 0%, #ffffff 100%);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-light) 100%);
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.upload-content svg {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-content p {
    margin: 0.5rem 0;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
    text-decoration: none;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.3), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, hsl(346, 75%, 62%) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(232, 51, 120, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(232, 51, 120, 0.4);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(100, 116, 139, 0.2);
}

.btn-secondary:hover:not(:disabled) {
    background-color: #475569;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(100, 116, 139, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input[type="range"] {
    width: 100%;
}

.form-group input[type="color"] {
    width: 100px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.full-width {
    grid-column: 1 / -1;
}

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

.small {
    font-size: 0.875rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Advanced Sections */
.advanced-section {
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(250,250,250,0.9) 100%);
    transition: all 0.3s ease;
}

.advanced-section:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.advanced-section summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    user-select: none;
    padding: 0.75rem;
    color: var(--text-color);
    transition: all 0.2s;
    display: flex;
    align-items: center;
}

.advanced-section summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 0.5rem;
    transition: transform 0.3s;
    color: var(--primary-color);
}

.advanced-section[open] summary::before {
    transform: rotate(90deg);
}

.advanced-section summary:hover {
    color: var(--primary-color);
}

.advanced-section[open] summary {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary-light);
}

/* Analysis Results */
.analysis-results {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.info-item {
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: 0.375rem;
}

.info-item label {
    display: block;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.info-item span {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.recommendations {
    background-color: var(--bg-color);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 0.375rem;
}

.recommendations h3 {
    margin-bottom: 1rem;
}

.recommendations ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.recommendations li {
    margin: 0.5rem 0;
}

/* Preview Panel */
.preview-panel {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 1.5rem;
    margin-top: 2rem;
}

.preview-panel h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.preview-panel p {
    margin: 0.5rem 0;
}

/* Status Messages */
.status-message,
.error-message,
.warning-message,
.success-message {
    padding: 1rem;
    border-radius: 0.375rem;
    margin: 1rem 0;
}

.status-message {
    background-color: #dbeafe;
    color: #1e40af;
}

.error-message {
    background-color: #fee2e2;
    color: #991b1b;
}

.warning-message {
    background-color: #fef3c7;
    color: #92400e;
}

.success-message {
    background-color: #d1fae5;
    color: #065f46;
    text-align: center;
}

.success-message svg {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.success-message h3 {
    color: var(--success-color);
}

/* Processing */
.processing-status {
    text-align: center;
    padding: 3rem 2rem;
}

.spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 2rem;
    animation: spin 1s linear infinite;
}

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

#status-message {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.progress-bar {
    max-width: 400px;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 999px;
    margin: 2rem auto 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s;
    width: 0;
}

/* Result */
.result-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.result-preview {
    text-align: center;
}

.result-info {
    background-color: var(--bg-color);
    padding: 1.5rem;
    border-radius: 0.375rem;
}

.result-info p {
    margin: 0.75rem 0;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    box-shadow: 0 -1px 3px 0 rgb(0 0 0 / 0.1);
    padding: 1.5rem 0;
    margin-top: auto;
    text-align: center;
    color: var(--text-muted);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, hsl(346, 85%, 42%) 100%);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: drift 20s linear infinite;
}

@keyframes drift {
    from { transform: translate(0, 0); }
    to { transform: translate(50px, 50px); }
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 1rem;
    position: relative;
    z-index: 1;
}

.login-box {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: 3rem 2.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.login-box h1 {
    font-weight: 700;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, hsl(346, 75%, 62%) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.login-form .form-group:last-of-type {
    margin-bottom: 1rem;
}

.login-form .btn {
    width: 100%;
    margin-top: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 1.25rem 1rem;
    }

    header h1 {
        font-size: 1.25rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mt-2 {
    margin-top: 1rem;
}