@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --bg-dark: #121318;
    --sidebar-bg: #1d1e24;
    --panel-bg: #20212a;
    --card-bg: #2d2f3a;
    --input-bg: #282a36;
    --modal-input-bg: #1d1e24;
    
    --border-color: rgba(255, 255, 255, 0.05);
    
    --menu-active-bg: #ccd1ec;
    --menu-active-text: #1d1e24;
    
    --accent-btn-bg: #ccd1ec;
    --accent-btn-text: #1d1e24;
    --save-btn-bg: #c5c9d6;
    --cancel-btn-bg: #383b47;
    
    --text-primary: #ffffff;
    --text-secondary: #a3a6b1;
    --text-muted: #5d606f;
    
    --success-color: #10b981;
    --danger-color: #ef4444;
    --overdue-bg: rgba(239, 68, 68, 0.08);
}

/* 
  PROFESSIONAL SCALING APPROACH: 
  Setting base html font size to 110% scales the entire application up 
  proportionally by 10% in a W3C-standard, standard-compliant way!
*/
html {
    font-size: 110%; 
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--panel-bg);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* 1. MAIN APP DASHBOARD WRAPPER (CLEAN FULL-SCREEN FRAME) */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    background-color: var(--panel-bg);
    overflow: hidden;
}

/* 2. SIDEBAR STYLING */
.sidebar {
    width: 15.625rem; /* 250px mapped to rem */
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1.375rem 1.5rem; /* 22px 24px */
    display: flex;
    align-items: center;
}

.brand-name {
    font-size: 0.938rem; /* 15px */
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.031rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-name::before {
    content: "⚡";
    font-size: 0.875rem;
    color: #a78bfa;
}

.sidebar-menu {
    padding: 0.625rem 0.75rem; /* 10px 12px */
    flex-grow: 1;
    overflow-y: auto;
}

.menu-title {
    font-size: 0.688rem; /* 11px */
    font-weight: 600;
    color: #6b6e7a;
    margin-bottom: 0.625rem;
    padding-left: 0.625rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.add-list-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 300;
    padding-right: 0.25rem;
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 0.563rem 0.75rem; /* 9px 12px */
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 0.375rem;
    font-size: 0.813rem; /* 13px */
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    margin-bottom: 0.25rem;
    transition: all 0.15s ease;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.menu-item.active {
    background: var(--menu-active-bg);
    color: var(--menu-active-text);
    font-weight: 500;
}

.menu-item .icon {
    margin-right: 0.625rem;
    font-size: 0.938rem;
}

/* Sidebar Footer (Settings / Sync) */
.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.footer-item {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    text-align: left;
    font-size: 0.813rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    transition: all 0.15s ease;
}

.footer-item:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.footer-item .icon {
    margin-right: 0.625rem;
}

/* 3. MAIN PANEL STYLING */
.main-panel {
    flex-grow: 1;
    background-color: var(--panel-bg);
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1.875rem 2.5rem; /* 30px 40px */
}

.main-header {
    margin-bottom: 1.125rem;
}

.main-header h1 {
    font-size: 1.625rem; /* 26px */
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.019rem;
}

/* Utility Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 0.938rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

#sortSelect {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    outline: none;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
}

#sortSelect option {
    background: var(--sidebar-bg);
    color: var(--text-primary);
}

/* Search bar */
.search-box {
    position: relative;
    width: 10rem; /* 160px */
}

.search-box input {
    width: 100%;
    padding: 0.375rem 0.75rem 0.375rem 1.625rem; /* 6px 12px 6px 26px */
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    color: var(--text-primary);
    font-size: 0.75rem;
    outline: none;
}

.search-box input:focus {
    border-color: rgba(255, 255, 255, 0.2);
}

.search-icon {
    position: absolute;
    left: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.625rem;
    color: var(--text-muted);
}

/* Compact Task Creator */
.task-creator {
    display: flex;
    gap: 0.5rem;
    background: var(--input-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 0.375rem 0.5rem;
    border-radius: 0.375rem;
    margin-bottom: 1.125rem;
}

.task-creator input {
    flex-grow: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.813rem;
    padding: 0.375rem;
}

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

.add-task-btn {
    padding: 0.375rem 0.875rem; /* 6px 14px */
    background-color: var(--accent-btn-bg);
    color: var(--accent-btn-text);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.add-task-btn:hover {
    background-color: #ffffff;
    color: #1d1e24;
}

/* 4. SCROLLABLE TASK LIST AREA */
.tasks-area {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 0.375rem;
}

.tasks-area::-webkit-scrollbar {
    width: 0.25rem;
}

.tasks-area::-webkit-scrollbar-track {
    background: transparent;
}

.tasks-area::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 0.125rem;
}

#todoList {
    list-style: none;
    display: flex;
    flex-direction: column;
}

li {
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 0;
    padding: 0.75rem 0.5rem; /* 12px 8px */
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.15s ease;
}

li:hover {
    background: rgba(255, 255, 255, 0.015);
}

.todo-left {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    flex-grow: 1;
}

/* Custom Checkbox */
.custom-checkbox {
    width: 1.125rem; /* 18px */
    height: 1.125rem;
    border: 1.5px solid rgba(255, 255, 255, 0.25);
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
    background: transparent;
}

.custom-checkbox:hover {
    border-color: rgba(255, 255, 255, 0.4);
}

.custom-checkbox.checked {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}

.custom-checkbox::after {
    content: "✓";
    color: var(--text-primary);
    font-size: 0.688rem;
    font-weight: 700;
    display: none;
}

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

/* Task details */
.todo-content {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.todo-title {
    font-size: 0.844rem; /* 13.5px */
    font-weight: 400;
    color: var(--text-primary);
    cursor: pointer;
}

.todo-title:hover {
    text-decoration: underline;
}

/* Date Pill Badge */
.date-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem; /* 2px 8px */
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.25rem;
    font-size: 0.625rem; /* 10px */
    font-weight: 500;
    color: var(--text-secondary);
    width: fit-content;
    margin-top: 0.188rem;
}

.date-badge.overdue {
    background: var(--overdue-bg);
    color: var(--danger-color);
}

/* Completed Task state */
.completed .todo-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

.completed .date-badge {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Action Icons */
.todo-actions {
    display: flex;
    align-items: center;
    gap: 0.125rem;
}

.action-icon-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    width: 1.625rem; /* 26px */
    height: 1.625rem;
    border-radius: 0.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    transition: all 0.15s ease;
}

.action-icon-btn:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.action-icon-btn.delete-icon:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* Footer status bar */
.panel-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.875rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.sync-status {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.688rem;
}

.status-dot {
    width: 0.375rem;
    height: 0.375rem;
    background-color: var(--success-color);
    border-radius: 50%;
    box-shadow: 0 0 0.375rem var(--success-color);
}

.clear-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    cursor: pointer;
    font-weight: 500;
}

.clear-btn:hover {
    color: var(--text-primary);
}

/* 5. TASK DETAILS DIALOG / ACCORDION MODAL */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.modal.active {
    opacity: 1;
    pointer-events: all;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.modal-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.375rem; /* 22px */
    width: 100%;
    max-width: 25rem; /* 400px */
    position: relative;
    z-index: 101;
    transform: scale(0.95);
    transition: transform 0.2s ease;
    box-shadow: 0 0.938rem 2.5rem rgba(0, 0, 0, 0.5);
}

.modal.active .modal-card {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.125rem;
}

.modal-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    font-size: 1.125rem;
    cursor: pointer;
}

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

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.313rem;
}

.form-group label {
    font-size: 0.688rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.title-input-wrapper,
.date-input-wrapper {
    position: relative;
    width: 100%;
}

.modal-body input,
.modal-body textarea {
    width: 100%;
    background: var(--modal-input-bg);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0.25rem;
    color: var(--text-primary);
    padding: 0.5rem 0.625rem;
    font-size: 0.813rem;
    outline: none;
}

.modal-body textarea {
    resize: none;
    overflow-y: hidden;
    min-height: 5.5rem;
}

.modal-body input:focus,
.modal-body textarea:focus {
    border-color: rgba(255, 255, 255, 0.2);
}

.clear-input-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    font-size: 0.75rem;
}

.clear-date-btn {
    background: #3a3c48;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    padding: 0 0.75rem;
    font-size: 0.688rem;
    font-weight: 500;
    cursor: pointer;
}

.clear-date-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.status-value {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.063rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-start;
    gap: 0.5rem;
    margin-top: 1.25rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.875rem;
}

.modal-btn {
    padding: 0.438rem 1rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
}

.save-btn {
    background-color: var(--save-btn-bg);
    color: #1c1e25;
}

.save-btn:hover {
    background-color: #ffffff;
}

.cancel-btn {
    background-color: var(--cancel-btn-bg);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.cancel-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.mini-card {
    max-width: 21.25rem; /* 340px */
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(0.25rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Global SVG Outline Vector Alignments */
svg {
    display: inline-block;
    vertical-align: middle;
    stroke: currentColor;
    fill: none;
}