/* Submit Article Page */
:root {
    --primary: #ea5686;
    --primary-dark: #d63f6f;
    --bg: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

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

html {
    -webkit-font-smoothing: antialiased;
}

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

/* Header */
.header {
    background: white;
    border-bottom: 1px solid var(--border);
}

.header-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
}

.header-title:hover {
    opacity: 0.8;
}

.header-back {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.header-back:hover {
    color: var(--text);
}

/* Main */
.main {
    flex: 1;
    padding: 2rem 1.5rem;
}

.container {
    max-width: 640px;
    margin: 0 auto;
}

/* Submit Card */
.submit-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.submit-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
}

.submit-subtitle {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Tabs */
.input-tabs {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 0.25rem;
    margin-bottom: 1.5rem;
}

.tab {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--text);
}

.tab.active {
    background: white;
    color: var(--text);
    box-shadow: var(--shadow-sm);
}

/* Forms */
.form-panel {
    display: none;
}

.form-panel.active {
    display: block;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    font-family: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(234, 86, 134, 0.15);
}

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

.form-textarea {
    resize: vertical;
    min-height: 160px;
}

.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-row .form-group {
    flex: 1;
}

.flex-1 {
    flex: 1;
}

/* File Drop */
.file-drop {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.file-drop:hover,
.file-drop.dragover {
    border-color: var(--primary);
    background: rgba(234, 86, 134, 0.03);
}

.file-drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 2rem;
    color: var(--text-muted);
}

.file-drop-content span {
    font-size: 0.9375rem;
    font-weight: 500;
}

.file-drop-content small {
    font-size: 0.75rem;
}

.file-selected {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
}

.file-selected span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

.file-remove-btn {
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    color: var(--text-muted);
    background: none;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-remove-btn:hover {
    color: #dc2626;
    background: rgba(220, 38, 38, 0.1);
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: white;
    background: linear-gradient(135deg, #ea5686 0%, #d63f6f 100%);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    margin-top: 0.5rem;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Message */
.form-message {
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
}

.form-message.success {
    color: #166534;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
}

.form-message.error {
    color: #991b1b;
    background: #fef2f2;
    border: 1px solid #fecaca;
}

/* Footer */
.footer {
    background: white;
    border-top: 1px solid var(--border);
    padding: 1.5rem;
}

.footer-content {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sponsor-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sponsor-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sponsor-logo {
    display: flex;
    align-items: center;
}

.sponsor-logo img {
    height: 24px;
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
    .submit-card {
        padding: 1.5rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .footer-content {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }
}