:root {
    --primary-color: #0078d4;
    --primary-hover: #005fa3;
    --success-color: #10a37f;
    --error-color: #d13438;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background: var(--bg-primary);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    margin-bottom: 20px;
}

.header {
    text-align: center;
    margin-bottom: 32px;
}

.icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

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

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

input,
textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.2s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

.char-counter {
    text-align: right;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-text,
.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

.spinner-circle {
    fill: none;
    stroke: white;
    stroke-width: 3;
    stroke-dasharray: 50;
    stroke-dashoffset: 25;
}

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

.notification {
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    font-size: 14px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.notification.success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.notification.error {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

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

.footer {
    text-align: center;
    color: white;
    font-size: 14px;
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 600px) {
    .card {
        padding: 24px;
    }

    h1 {
        font-size: 24px;
    }

    .icon {
        width: 48px;
        height: 48px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e0e0e0;
        --text-secondary: #b0b0b0;
        --bg-primary: #1e1e1e;
        --bg-secondary: #2a2a2a;
        --border-color: #404040;
    }

    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }

    input,
    textarea {
        background: var(--bg-secondary);
        color: var(--text-primary);
    }
}