/* ==================== CSS RESET & VARIABLES ==================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Dark theme (default) */
    --bg-primary: #0f1119;
    --bg-secondary: #1a1d2b;
    --bg-card: #212433;
    --bg-card-hover: #282c3d;
    --bg-input: #1a1d2b;
    --border-color: #2e3344;
    --border-focus: #5b6af0;
    --text-primary: #e8e9f0;
    --text-secondary: #a0a4b5;
    --text-muted: #6b6f82;
    --accent: #f5a623;
    --accent-hover: #f7b84e;
    --accent-dim: rgba(245, 166, 35, 0.15);
    --success: #4caf84;
    --success-dim: rgba(76, 175, 132, 0.15);
    --danger: #e0556a;
    --danger-dim: rgba(224, 85, 106, 0.15);
    --warning: #e8a840;
    --warning-dim: rgba(232, 168, 64, 0.15);
    --info: #5b8af0;
    --toggle-bg: #3a3f55;
    --toggle-active: #4caf84;
    --slider-track: #3a3f55;
    --slider-fill: #f5a623;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Light theme */
[data-theme="light"] {
    --bg-primary: #f4f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fb;
    --bg-input: #f0f1f4;
    --border-color: #e2e4ea;
    --border-focus: #5b6af0;
    --text-primary: #1a1d2b;
    --text-secondary: #555a6b;
    --text-muted: #8b8f9e;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --toggle-bg: #ccd0d9;
    --slider-track: #dcdfe5;
}

/* ==================== BASE STYLES ==================== */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
    padding-bottom: env(safe-area-inset-bottom, 20px);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== HEADER ==================== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.6rem;
    line-height: 1;
}

.header-left h1 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 20px;
    background-color: var(--bg-card);
    cursor: default;
    transition: background-color var(--transition-normal);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.status-dot.connected {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
    animation: pulse-status 2s infinite;
}

.status-dot.connecting {
    background-color: var(--warning);
    box-shadow: 0 0 8px var(--warning);
    animation: pulse-status 0.8s infinite;
}

.status-dot.disconnected {
    background-color: var(--danger);
}

.status-dot.unknown {
    background-color: var(--text-muted);
}

@keyframes pulse-status {
    0%,
    100% {
        box-shadow: 0 0 4px currentColor;
    }
    50% {
        box-shadow: 0 0 14px currentColor, 0 0 24px currentColor;
    }
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background-color: var(--bg-card-hover);
    transform: scale(1.05);
}

.icon-btn:active {
    transform: scale(0.95);
    transition: transform 80ms ease;
}

/* ==================== CONNECTION PANEL ==================== */
.connection-panel {
    padding: 16px;
    max-width: 500px;
    margin: 0 auto;
}

.panel-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.panel-card h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    text-align: center;
}

/* CORS Warning */
.cors-warning {
    background-color: var(--warning-dim);
    border: 1px solid var(--warning);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    margin-bottom: 18px;
    font-size: 0.85rem;
    animation: slideDown 0.3s ease;
}

.cors-warning strong {
    display: block;
    margin-bottom: 6px;
}

.cors-warning ul {
    margin: 8px 0;
    padding-left: 18px;
}

.cors-warning li {
    margin-bottom: 3px;
}

.cors-warning code {
    background-color: var(--bg-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.78rem;
    word-break: break-all;
}

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

/* Input Group */
.input-group {
    margin-bottom: 18px;
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.input-with-button {
    display: flex;
    gap: 8px;
}

.input-with-button input {
    flex: 1;
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    display: block;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-color);
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-stack);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(91, 106, 240, 0.15);
}

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23a0a4b5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    cursor: pointer;
}

/* Buttons */
.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    border: none;
    background: linear-gradient(135deg, var(--accent), #e8951f);
    color: #1a1a1a;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-stack);
    letter-spacing: 0.01em;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(245, 166, 35, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: none;
    transition: transform 60ms ease;
}

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

.btn-secondary {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.9rem;
    font-family: var(--font-stack);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-small {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--font-stack);
    transition: all var(--transition-fast);
}

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

.btn-dismiss {
    margin-top: 10px;
    background-color: var(--warning);
    color: #1a1a1a;
    border: none;
    font-weight: 500;
}

.btn-dismiss:hover {
    opacity: 0.9;
}

.btn-refresh {
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-icon {
    font-size: 1.2rem;
}

/* Connect status */
.connect-status {
    margin-top: 12px;
    text-align: center;
    font-size: 0.85rem;
    min-height: 20px;
}

.connect-status.error {
    color: var(--danger);
}

.connect-status.success {
    color: var(--success);
}

/* Registration info */
.registration-info {
    margin-top: 16px;
    padding: 14px;
    background-color: var(--info);
    background-color: rgba(91, 138, 240, 0.1);
    border: 1px solid var(--info);
    border-radius: var(--radius-md);
    text-align: center;
    animation: slideDown 0.3s ease;
}

.registration-info p {
    margin-top: 8px;
}

.small-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.pulse-animation {
    display: flex;
    justify-content: center;
}

.pulse-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--info);
    animation: pulse-ring 1.2s infinite;
}

@keyframes pulse-ring {
    0% {
        box-shadow: 0 0 0 0 rgba(91, 138, 240, 0.6);
    }
    70% {
        box-shadow: 0 0 0 18px rgba(91, 138, 240, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(91, 138, 240, 0);
    }
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    padding: 12px 12px 100px;
    max-width: 700px;
    margin: 0 auto;
    animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 4px;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 60px;
    z-index: 50;
}

.tab-btn {
    flex: 1;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-stack);
    white-space: nowrap;
}

.tab-btn span {
    margin-right: 4px;
}

.tab-btn.active {
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

.tab-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 0 4px;
}

.device-count {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media (min-width: 600px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Light & Group Card */
.device-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.device-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    border-radius: 4px 0 0 4px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.device-card.on::before {
    opacity: 1;
}

.device-card.on {
    border-color: rgba(245, 166, 35, 0.3);
    background-color: var(--bg-card);
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.08);
}

.device-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    flex: 1;
    margin-right: 12px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 50px;
    height: 28px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-bg);
    border-radius: 28px;
    transition: all var(--transition-fast);
}

.toggle-switch label::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    border-radius: 50%;
    transition: all var(--transition-fast);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked+label {
    background-color: var(--toggle-active);
}

.toggle-switch input:checked+label::after {
    transform: translateX(22px);
}

/* Brightness Slider */
.brightness-control {
    margin-bottom: 10px;
}

.brightness-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.brightness-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 6px;
    background: var(--slider-track);
    outline: none;
    cursor: pointer;
}

.brightness-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: #ffffff;
    border: 2px solid var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: transform var(--transition-fast);
}

.brightness-slider::-webkit-slider-thumb:active {
    transform: scale(1.2);
}

.brightness-slider::-moz-range-thumb {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: #ffffff;
    border: 2px solid var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Color Picker */
.color-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-picker-input {
    -webkit-appearance: none;
    appearance: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    cursor: pointer;
    padding: 2px;
    background: transparent;
    transition: border-color var(--transition-fast);
}

.color-picker-input:hover {
    border-color: var(--accent);
}

.color-picker-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-input::-webkit-color-swatch {
    border-radius: 50%;
    border: none;
}

.color-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Card type badge */
.card-type-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    background-color: var(--bg-primary);
    color: var(--text-muted);
    margin-left: 8px;
    flex-shrink: 0;
}

/* ==================== TIMER SECTION ==================== */
.timer-form-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 16px;
}

.timer-form-card h3 {
    margin-bottom: 14px;
    font-size: 1rem;
}

.timer-form .form-row {
    margin-bottom: 12px;
}

.timer-form label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.timer-form .btn-primary {
    margin-top: 8px;
}

.active-timers {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.active-timers h3 {
    margin-bottom: 14px;
    font-size: 1rem;
}

.timers-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timer-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease;
}

.timer-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.timer-target-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.timer-remaining {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.timer-remaining.urgent {
    color: var(--danger);
    animation: pulse-text 0.8s infinite;
}

@keyframes pulse-text {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.btn-cancel-timer {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--danger);
    background-color: var(--danger-dim);
    color: var(--danger);
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--font-stack);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-cancel-timer:hover {
    background-color: var(--danger);
    color: #fff;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-muted);
    text-align: center;
}

.empty-state span {
    font-size: 3rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
}

/* ==================== LOADING OVERLAY ==================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 17, 25, 0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 200;
    gap: 16px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.loading-overlay p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==================== TOASTS ==================== */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: calc(100% - 32px);
    max-width: 450px;
    pointer-events: none;
}

.toast {
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    animation: toastIn 0.35s cubic-bezier(0.22, 0.61, 0.36, 1), toastOut 0.3s ease 2.5s forwards;
    pointer-events: auto;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast.success {
    background-color: #1b3d2e;
    color: #7ee8b5;
    border: 1px solid var(--success);
}

.toast.error {
    background-color: #3d1b22;
    color: #f0909e;
    border: 1px solid var(--danger);
}

.toast.info {
    background-color: #1b2a3d;
    color: #90b8f0;
    border: 1px solid var(--info);
}

.toast.warning {
    background-color: #3d351b;
    color: #f0d890;
    border: 1px solid var(--warning);
}

[data-theme="light"] .toast.success {
    background-color: #e6f7ee;
    color: #1a6b3c;
}

[data-theme="light"] .toast.error {
    background-color: #fde8ec;
    color: #b83245;
}

[data-theme="light"] .toast.info {
    background-color: #e8f0fd;
    color: #2d5bbf;
}

[data-theme="light"] .toast.warning {
    background-color: #fdf5e0;
    color: #8a5d14;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    to {
        opacity: 0;
        transform: translateY(-20px) scale(0.9);
    }
}

/* ==================== RESPONSIVE ADJUSTMENTS ==================== */
@media (max-width: 380px) {
    .tab-btn {
        font-size: 0.78rem;
        padding: 8px 8px;
    }

    .tab-btn span {
        display: none;
    }

    .device-card {
        padding: 12px;
    }

    .card-name {
        font-size: 0.85rem;
    }

    .app-header {
        padding: 10px 12px;
        gap: 6px;
    }

    .header-left h1 {
        font-size: 1.1rem;
    }

    .connection-status {
        font-size: 0.7rem;
        padding: 3px 8px;
    }
}

@media (min-width: 768px) {
    .main-content {
        padding: 20px 20px 100px;
    }

    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 14px;
    }

    .connection-panel {
        padding: 32px 16px;
    }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}