/* ============================================
   BUTTON RESET
   ============================================ */
.btn-reset {
    background: none;
    border: none;
    font: inherit;
    cursor: pointer;
    outline: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
}

/* ============================================
   PRIMARY BUTTON
   ============================================ */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--text-primary);
    color: var(--bg-main);
    padding: 0.875rem 2.25rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    transition: transform var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-normal) var(--ease-out),
                background var(--duration-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.2);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary.btn-lg {
    padding: 1rem 2.75rem;
    font-size: 1rem;
}

/* ============================================
   GLASS BUTTON
   ============================================ */
.btn-glass {
    background: var(--glass-highlight);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.625rem;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast), border-color var(--duration-fast), color var(--duration-fast), transform var(--duration-fast);
    font-size: 0.95rem;
}

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

.btn-glass:active { transform: translateY(0); }

/* ============================================
   ICON BUTTON
   ============================================ */
.btn-icon {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    transition: all var(--duration-fast);
    font-size: 0.85rem;
}

.btn-icon:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text-primary);
    border-color: var(--glass-border-hover);
}

/* ============================================
   CARD (GLASS)
   ============================================ */
.card-glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-card);
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: background var(--duration-normal), border-color var(--duration-normal), transform var(--duration-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-2px);
}

/* ============================================
   BADGE
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.25);
    color: var(--accent-cyan);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--text-primary);
    z-index: var(--z-toast);
    transition: transform 0.3s var(--ease-spring), opacity 0.3s;
    opacity: 0;
    white-space: nowrap;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: var(--z-modal);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    animation: scaleUp 0.25s var(--ease-spring);
    border-radius: var(--radius-xl);
}

.modal-lg { max-width: 680px; }

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 1.75rem;
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-header h2 {
    font-size: 1.25rem;
    margin: 0;
}

.modal-body { padding: 1.75rem; }

.modal-footer {
    padding: 1.25rem 1.75rem;
    border-top: 1px solid var(--glass-border);
    background: rgba(0,0,0,0.15);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.close-modal-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 1rem;
    transition: color var(--duration-fast), transform var(--duration-fast);
    background: none;
    border: none;
    cursor: pointer;
}

.close-modal-btn:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}

/* ============================================
   FORM INPUTS
   ============================================ */
.input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
    appearance: none;
}

.input:focus {
    outline: none;
    border-color: var(--mode-focus);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

.input-group {
    display: flex;
    gap: 0.5rem;
}

.input-group .input { flex: 1; }

/* ============================================
   SETTING GROUP
   ============================================ */
.setting-group {
    margin-bottom: 1.25rem;
}

.setting-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}

.setting-group .input {
    background: var(--bg-input);
    border: 1px solid var(--glass-border);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
}

.setting-group .input:focus {
    border-color: var(--mode-focus);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 480px) {
    .modal-body { padding: 1.25rem; }
    .modal-header { padding: 1.25rem; }
    .modal-footer { padding: 1rem 1.25rem; }
}