/* style.css */
:root, [data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --input-bg: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    
    --success-bg: #064e3b;
    --success-text: #34d399;
    --warning-bg: #78350f;
    --warning-text: #fbbf24;
    --error-bg: #7f1d1d;
    --error-text: #f87171;
    
    --radius: 12px;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #94a3b8;
    --secondary-hover: #64748b;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --input-bg: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #475569;
    --border-color: #e2e8f0;
    
    --success-bg: #d1fae5;
    --success-text: #065f46;
    --warning-bg: #fef3c7;
    --warning-text: #92400e;
    --error-bg: #fee2e2;
    --error-text: #991b1b;
}

[data-theme="colorful"] {
    --primary-color: #ec4899;
    --primary-hover: #db2777;
    --secondary-color: #8b5cf6;
    --secondary-hover: #7c3aed;
    --bg-color: #4c1d95;
    --card-bg: #5b21b6;
    --input-bg: #4c1d95;
    --text-main: #ffffff;
    --text-muted: #eaddff;
    --border-color: #7c3aed;
    
    --success-bg: #059669;
    --success-text: #d1fae5;
    --warning-bg: #d97706;
    --warning-text: #fef3c7;
    --error-bg: #dc2626;
    --error-text: #fee2e2;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.header {
    text-align: center;
    padding: 40px 20px 20px;
}

.header h1 a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-muted);
    margin-top: 10px;
    font-size: 1.1rem;
}

.main-content {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

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

textarea, input[type="text"], input[type="email"] {
    width: 100%;
    padding: 15px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

textarea {
    resize: vertical;
}

textarea:focus, input[type="text"]:focus, input[type="email"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Optional Email Group Enhancements */
.email-group {
    position: relative;
    background: rgba(30, 41, 59, 0.5);
    padding: 20px;
    border-radius: 10px;
    border: 1px dashed var(--border-color);
    margin-top: 10px;
}

.email-group label {
    color: #cbd5e1;
    font-weight: 600;
}

.email-group .hint {
    display: block;
    margin-top: 8px;
    text-align: left;
    color: #64748b;
    font-size: 0.85rem;
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--secondary-hover);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.alert-success {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.alert-warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.alert-error {
    background-color: var(--error-bg);
    color: var(--error-text);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.link-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    margin-bottom: 15px;
}

.link-group input {
    flex: 1;
    color: #60a5fa;
    font-weight: 600;
    background-color: #0f172a;
}

.link-group .btn {
    width: auto;
    white-space: nowrap;
}

.hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

.hidden {
    display: none !important;
}

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

.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

.secret-box textarea {
    min-height: 150px;
    margin-bottom: 15px;
    background-color: var(--input-bg);
    color: var(--primary-color);
    font-size: 1.1rem;
    border-color: var(--primary-hover);
}

/* Theme Switcher Styles */
.theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switcher select {
    background-color: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    outline: none;
}

.theme-switcher select:focus {
    border-color: var(--primary-color);
}

/* Animations */
.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

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

/* --- Mobile Responsiveness --- */
@media (max-width: 600px) {
    .container {
        margin: 15px auto;
        padding: 20px;
        width: 95%;
    }

    .header h1 {
        font-size: 1.8rem;
    }

    .theme-switcher {
        top: 10px;
        right: 10px;
    }

    .theme-switcher select {
        padding: 6px 8px;
        font-size: 0.85rem;
    }

    textarea, input[type="text"], input[type="email"] {
        padding: 12px;
        font-size: 0.95rem;
    }

    .btn {
        padding: 12px;
        font-size: 1rem;
    }

    .secret-box textarea {
        min-height: 120px;
    }

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

    .link-group .btn {
        width: 100%;
        margin-top: 10px;
    }
}