/**
 * Cloud Todo App - Shadcn-inspired Design System
 * Clean, minimal dark theme with zinc palette
 */

/* ===== Design Tokens ===== */
:root {
    /* Shadcn Zinc Dark */
    --background: #09090b;
    --foreground: #fafafa;
    --card: #09090b;
    --card-foreground: #fafafa;
    --popover: #09090b;
    --popover-foreground: #fafafa;
    --primary: #fafafa;
    --primary-foreground: #18181b;
    --secondary: #27272a;
    --secondary-foreground: #fafafa;
    --muted: #27272a;
    --muted-foreground: #a1a1aa;
    --accent: #27272a;
    --accent-foreground: #fafafa;
    --destructive: #ef4444;
    --border: #27272a;
    --input: #27272a;
    --ring: #d4d4d8;

    /* Extended palette */
    --zinc-50: #fafafa;
    --zinc-100: #f4f4f5;
    --zinc-200: #e4e4e7;
    --zinc-300: #d4d4d8;
    --zinc-400: #a1a1aa;
    --zinc-500: #71717a;
    --zinc-600: #52525b;
    --zinc-700: #3f3f46;
    --zinc-800: #27272a;
    --zinc-900: #18181b;
    --zinc-950: #09090b;

    /* Accent */
    --brand: #818cf8;
    --brand-foreground: #ffffff;

    /* Radius */
    --radius: 0.5rem;

    /* Scrollbar */
    --scroll-track: var(--zinc-900);
    --scroll-thumb: var(--zinc-700);
    --scroll-thumb-hover: var(--zinc-600);
}

/* ===== Light Theme ===== */
html.light {
    --background: #ffffff;
    --foreground: #09090b;
    --card: #ffffff;
    --card-foreground: #09090b;
    --popover: #ffffff;
    --popover-foreground: #09090b;
    --primary: #18181b;
    --primary-foreground: #fafafa;
    --secondary: #f4f4f5;
    --secondary-foreground: #18181b;
    --muted: #f4f4f5;
    --muted-foreground: #71717a;
    --accent: #f4f4f5;
    --accent-foreground: #18181b;
    --destructive: #ef4444;
    --border: #e4e4e7;
    --input: #e4e4e7;
    --ring: #a1a1aa;
    --scroll-track: var(--zinc-100);
    --scroll-thumb: var(--zinc-300);
    --scroll-thumb-hover: var(--zinc-400);
}

/* ===== Semantic Utilities ===== */
.text-main {
    color: var(--foreground) !important;
}

.text-sub {
    color: var(--muted-foreground) !important;
}

.text-muted-custom {
    color: var(--zinc-500) !important;
}

.bg-surface {
    background-color: var(--card) !important;
}

.border-base {
    border-color: var(--border) !important;
}

.placeholder-custom::placeholder {
    color: var(--muted-foreground);
    opacity: 0.5;
}

/* Muted background for panels/stat cards */
.bg-muted {
    background-color: var(--muted) !important;
}

/* Hover background */
.hover-bg-accent:hover {
    background-color: var(--accent) !important;
}

/* Input background */
.bg-input {
    background-color: var(--input) !important;
}

/* Secondary text for labels */
.text-label {
    color: var(--muted-foreground) !important;
}

/* ===== Base ===== */
* {
    box-sizing: border-box;
}

body {
    background: var(--background);
    min-height: 100vh;
    color: var(--foreground);
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scroll-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scroll-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scroll-thumb-hover);
}

/* ===== Card ===== */
.glass-card {
    background: var(--card);
    border: 1px solid var(--border);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* ===== Gradient Border → Clean Border ===== */
.gradient-border {
    position: relative;
    background: var(--card);
    border: 1px solid var(--border);
}

.gradient-border::before {
    display: none;
    /* Remove animated gradient border */
}

/* ===== Todo Items ===== */
.todo-item {
    transition: all 0.15s ease;
    border: 1px solid var(--border);
}

.todo-item:hover {
    transform: none;
    background-color: var(--accent) !important;
    border-color: var(--zinc-600);
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: var(--muted-foreground);
}

.todo-item.dragging {
    opacity: 0.5;
    transform: scale(1.01);
}

.todo-item.drag-over {
    border-top: 2px solid var(--brand);
}

/* ===== Checkbox (shadcn style) ===== */
.custom-checkbox {
    position: relative;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.custom-checkbox input {
    opacity: 0;
    width: 0;
    height: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    width: 18px;
    height: 18px;
    background: transparent;
    border: 1px solid var(--zinc-600);
    border-radius: calc(var(--radius) * 0.5);
    transition: all 0.15s ease;
}

.custom-checkbox:hover .checkmark {
    border-color: var(--zinc-400);
}

.custom-checkbox input:checked~.checkmark {
    background: var(--foreground);
    border-color: var(--foreground);
}

.checkmark::after {
    content: '';
    position: absolute;
    display: none;
    left: 5px;
    top: 1px;
    width: 5px;
    height: 10px;
    border: solid var(--background);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.custom-checkbox input:checked~.checkmark::after {
    display: block;
}

/* ===== Action Buttons (ghost style) ===== */
.delete-btn,
.edit-btn,
.subtask-toggle-btn,
.tag-btn {
    opacity: 0;
    transition: all 0.15s ease;
}

.todo-item:hover .delete-btn,
.todo-item:hover .edit-btn,
.todo-item:hover .subtask-toggle-btn,
.todo-item:hover .tag-btn {
    opacity: 1;
}

/* ===== Input Focus ===== */
.input-glow:focus {
    box-shadow: 0 0 0 2px var(--background), 0 0 0 4px var(--ring);
    border-color: var(--zinc-500);
    outline: none;
}

/* ===== Animations (subtle) ===== */
@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-6px);
    }
}

.float-animation {
    animation: float 3s ease-in-out infinite;
}

@keyframes pulse-soft {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

.pulse-soft {
    animation: pulse-soft 2s ease-in-out infinite;
}

/* ===== Status Indicator ===== */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-online {
    background: #22c55e;
}

.status-offline {
    background: #ef4444;
}

.status-syncing {
    background: #f59e0b;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* ===== Toast ===== */
.toast {
    animation: slideIn 0.2s ease forwards;
    border: 1px solid var(--border);
    background: var(--card);
}

.toast.hide {
    animation: slideOut 0.2s ease forwards;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }

    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ===== Primary Button (shadcn default) ===== */
.add-btn {
    background: var(--foreground);
    color: var(--background);
    transition: all 0.15s ease;
    font-weight: 500;
}

.add-btn:hover {
    opacity: 0.9;
    transform: none;
    box-shadow: none;
}

.add-btn:active {
    transform: scale(0.98);
}

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

/* ===== Filter Tabs (shadcn tabs) ===== */
.filter-tab {
    transition: all 0.15s ease;
    color: var(--muted-foreground);
}

.filter-tab.active {
    background: var(--secondary);
    border-color: var(--border);
    color: var(--foreground);
}

.filter-tab:hover:not(.active) {
    color: var(--foreground);
}

/* ===== Skeleton ===== */
.skeleton {
    background: linear-gradient(90deg, var(--zinc-800) 25%, var(--zinc-700) 50%, var(--zinc-800) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* ===== Fade In ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.2s ease forwards;
}

/* ===== Modal ===== */
.modal-overlay {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-enter {
    animation: modalEnter 0.2s ease forwards;
}

@keyframes modalEnter {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(8px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ===== Auth Tabs ===== */
.auth-tab {
    transition: all 0.15s ease;
    color: var(--muted-foreground);
}

.auth-tab.active {
    background: var(--foreground);
    color: var(--background);
    font-weight: 500;
}

.auth-tab:not(.active) {
    background: transparent;
    color: var(--muted-foreground);
}

.auth-tab:not(.active):hover {
    color: var(--foreground);
}

/* ===== View Toggle ===== */
.view-toggle-btn {
    color: var(--muted-foreground);
    transition: all 0.15s ease;
}

.view-toggle-btn.active {
    background: var(--secondary);
    color: var(--foreground);
}

.view-toggle-btn:hover:not(.active) {
    color: var(--foreground);
}

/* ===== Kanban ===== */
.kanban-card {
    transition: all 0.15s ease;
    background: var(--card);
    border: 1px solid var(--border);
}

.kanban-card:hover {
    transform: translateY(-1px);
    border-color: var(--zinc-600);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.kanban-column>div[id^="kanban-"] {
    transition: background-color 0.15s ease;
    border-radius: var(--radius);
}

/* ===== Kanban Drop Indicators ===== */
.kanban-drop-above {
    border-top: 2px solid var(--brand) !important;
}

.kanban-drop-below {
    border-bottom: 2px solid var(--brand) !important;
}

.kanban-card.kanban-dragging {
    opacity: 0.4;
    transform: scale(0.97);
}

/* ===== Tag Chips ===== */
.tag-chip {
    transition: all 0.15s ease;
    border: 1px solid transparent;
    font-size: 0.7rem;
}

.tag-chip:hover {
    opacity: 0.8;
}

/* ===== Priority Indicator ===== */
.priority-indicator {
    font-size: 0.65rem;
    line-height: 1;
}

/* ===== Subtask Panel ===== */
.subtask-panel {
    border-color: var(--border);
}

/* ===== Focus visible (accessibility) ===== */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--ring);
    outline-offset: 2px;
}

/* ===== Social Login Buttons ===== */
.social-btn {
    transition: all 0.15s ease;
    border: 1px solid var(--border);
}

.social-btn:hover {
    border-color: var(--zinc-600);
    background-color: var(--accent);
}