/* ============================================
   Components — Buttons, Inputs, Cards, Toasts
   ============================================ */

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.5;
    border-radius: var(--radius-md);
    transition: var(--transition-all);
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Primary */
.btn-primary {
    color: white;
    background: var(--color-accent-gradient);
    border: none;
    box-shadow: var(--shadow-sm), 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-gradient-hover);
    box-shadow: var(--shadow-md), var(--shadow-glow-strong);
    transform: translateY(-1px);
}

/* Secondary */
.btn-secondary {
    color: var(--color-text-primary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
}

/* Ghost */
.btn-ghost {
    color: var(--color-text-secondary);
    background: transparent;
}

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

/* Icon Button */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.btn-icon:hover:not(:disabled) {
    color: var(--color-text-primary);
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
}

/* Copy Button */
.btn-copy {
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
}

.btn-copy:hover:not(:disabled) {
    color: var(--color-accent-1);
    border-color: rgba(108, 99, 255, 0.3);
    background: var(--color-accent-glow);
}

.btn-copy.copied {
    color: var(--color-success);
    border-color: var(--color-success-border);
    background: var(--color-success-bg);
}

/* Download Button */
.btn-download {
    color: white;
    background: var(--color-success);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-md);
}

.btn-download:hover:not(:disabled) {
    background: #0ea472;
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

/* Danger button */
.btn-danger {
    color: white;
    background: var(--color-error);
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

/* Button sizes */
.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-3) var(--space-8);
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
}

/* --- Form Inputs --- */
.input,
.textarea,
.select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition-all);
}

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

.input:hover,
.textarea:hover,
.select:hover {
    background: var(--color-bg-input-hover);
    border-color: var(--color-border-hover);
}

.input:focus,
.textarea:focus,
.select:focus {
    background: var(--color-bg-input-focus);
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-glow);
}

.textarea {
    resize: vertical;
    min-height: 140px;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.textarea-lg {
    min-height: 250px;
}

.select {
    appearance: none;
    cursor: pointer;
    padding-right: var(--space-10);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239999cc' 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 var(--space-3) center;
}

/* Input with label */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-hint {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* Range Slider */
.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    border: 2px solid var(--color-bg-primary);
    box-shadow: var(--shadow-sm), var(--shadow-glow);
    cursor: pointer;
    transition: transform var(--duration-fast) ease;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--color-accent-gradient);
    border-radius: 50%;
    border: 2px solid var(--color-bg-primary);
    box-shadow: var(--shadow-sm), var(--shadow-glow);
    cursor: pointer;
}

/* Checkbox */
.checkbox-wrap {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    user-select: none;
}

.checkbox-wrap input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent-1);
    cursor: pointer;
}

/* --- Tabs --- */
.tabs {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
}

.tab-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-tertiary);
    border-radius: var(--radius-md);
    transition: var(--transition-all);
    text-align: center;
}

.tab-btn:hover {
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
}

.tab-btn.active {
    color: var(--color-text-primary);
    background: var(--color-bg-elevated);
    box-shadow: var(--shadow-xs);
}

/* --- Toast Notifications --- */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: 500;
    color: white;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    transform: translateX(120%);
    opacity: 0;
    transition: all var(--duration-slow) var(--ease-spring);
    backdrop-filter: blur(10px);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-success {
    border-left: 3px solid var(--color-success);
}

.toast-error {
    border-left: 3px solid var(--color-error);
}

.toast-warning {
    border-left: 3px solid var(--color-warning);
}

.toast-info {
    border-left: 3px solid var(--color-info);
}

.toast-icon {
    font-size: 1.1em;
    flex-shrink: 0;
}

/* --- Loading Spinner --- */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent-1);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

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

/* --- Toggle Switch --- */
.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: var(--transition-all);
}

.toggle-thumb {
    position: absolute;
    left: 3px;
    width: 18px;
    height: 18px;
    background: var(--color-text-tertiary);
    border-radius: 50%;
    transition: var(--transition-all);
    top: 50%;
    transform: translateY(-50%);
}

.toggle input:checked ~ .toggle-track {
    background: var(--color-accent-1);
    border-color: var(--color-accent-1);
}

.toggle input:checked ~ .toggle-thumb {
    left: 23px;
    background: white;
}

/* --- Inline Label-Value pair --- */
.label-value {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    font-size: var(--text-sm);
}

.label-value .label {
    color: var(--color-text-tertiary);
}

.label-value .value {
    color: var(--color-text-primary);
    font-weight: 600;
    font-family: var(--font-mono);
}

/* --- Result Box --- */
.result-box {
    padding: var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    word-break: break-all;
    position: relative;
    overflow-x: auto;
}

.result-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.result-box-label {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-tertiary);
    font-family: var(--font-sans);
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-3);
}

.stat-card {
    padding: var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-value {
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    line-height: 1.2;
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--space-1);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

/* --- Divider --- */
.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-6) 0;
}

/* --- Empty State --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12) var(--space-6);
    text-align: center;
    color: var(--color-text-tertiary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.4;
}

.empty-state-text {
    font-size: var(--text-lg);
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.empty-state-hint {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* --- Section Title --- */
.section-title {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

@media (max-width: 768px) { .input, .textarea, .select { font-size: 16px; } }