/* ==========================================
   CSS VARIABLES & RESET
   ========================================== */
:root {
    /* Colors */
    --primary: #ff4b72;
    --primary-hover: #ff2a55;
    --secondary: #8a2be2;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --error: #ef4444;
    --premium: #fbbf24;
    --border-color: #334155;

    /* Typography */
    --font-family: 'Inter', system-ui, sans-serif;
    
    /* Spacing & Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

/* ==========================================
   TYPOGRAPHY & UTILITIES
   ========================================== */
h1, h2, h3, h4 {
    line-height: 1.2;
    margin-bottom: 0.5em;
}

.text-primary { color: var(--primary); }
.text-premium { color: var(--premium); }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* Logo Image Styling */
.logo img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    border-radius: 4px;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-family: inherit;
    font-size: 1rem;
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-outline:hover {
    border-color: var(--text-main);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-success { background-color: var(--success); color: white; }
.btn-danger { background-color: var(--error); color: white; }

.icon-btn {
    background: rgba(0,0,0,0.5);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}
.icon-btn:hover {
    background: var(--primary);
    transform: scale(1.1);
}

/* ==========================================
   FORMS & INPUTS
   ========================================== */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: inherit;
    transition: var(--transition);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
    padding-right: 2.5rem;
}

.form-group input[type="file"] {
    padding: 0.5rem;
    background-color: var(--bg-input);
    cursor: pointer;
}

.form-group input[type="file"]::file-selector-button {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    margin-right: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.form-group input[type="file"]::file-selector-button:hover {
    background-color: var(--primary);
    border-color: var(--primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(255, 75, 114, 0.2);
}

.form-group input.invalid,
.form-group textarea.invalid {
    border-color: var(--error);
}

.error-message {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
    min-height: 1.25rem;
}

/* ==========================================
   MODALS & TOASTS
   ========================================== */
.modal {
    border: none;
    background: transparent;
    margin: auto;
    padding: 0;
}

.modal::backdrop {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 90vw;
    max-width: 400px;
    position: relative;
    border: 1px solid var(--border-color);
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
}

.close-btn:hover {
    color: var(--text-main);
}

#toast-container {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background-color: var(--bg-card);
    color: var(--text-main);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    border-left: 4px solid var(--primary);
    animation: slideUp 0.3s ease forwards;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--error); }

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ==========================================
   DEMO NAVIGATION (SPA SWITCHER)
   ========================================== */
.demo-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #000;
    padding: 0.5rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    z-index: 10000;
    border-bottom: 1px solid #333;
}
.demo-nav button {
    background: transparent;
    border: 1px solid #555;
    color: #fff;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}
.demo-nav button.active {
    background: var(--primary);
    border-color: var(--primary);
}
.view {
    display: none;
    min-height: 100vh;
    padding-top: 40px; /* Offset for demo nav */
}
.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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