:root {
    --primary: #635bff;
    --primary-dark: #5148e5;
    --primary-glow: rgba(99, 91, 255, 0.4);

    /* Default / Cosmic Dark Theme */
    --background: #070a18;
    --surface: rgba(14, 20, 44, 0.88);
    --surface-card: rgba(17, 24, 54, 0.92);
    --surface-hover: rgba(26, 36, 78, 0.95);
    --sidebar-bg: rgba(11, 16, 38, 0.94);
    --border: rgba(99, 91, 255, 0.24);
    --border-hover: rgba(0, 242, 254, 0.5);

    --text: #f1f4fc;
    --muted: #949db6;
    --heading-color: #ffffff;
    --welcome-color: #00f2fe;
    --welcome-glow: rgba(0, 242, 254, 0.5);

    --input-bg: rgba(11, 16, 36, 0.9);
    --input-border: rgba(99, 91, 255, 0.3);
    --input-text: #ffffff;

    --green: #20b486;
    --orange: #f59e0b;
    --red: #ef4444;
    --purple: #8b5cf6;

    --stat-blue-bg: rgba(99, 91, 255, 0.18);
    --stat-orange-bg: rgba(245, 158, 11, 0.18);
    --stat-green-bg: rgba(32, 180, 134, 0.18);
    --stat-purple-bg: rgba(139, 92, 246, 0.18);

    --sidebar-width: 250px;
    --radius: 16px;
    --theme-trans: background 0.5s ease, background-color 0.5s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

/* Light Theme Variables */
body.light-theme {
    --background: #f1f4fa;
    --surface: rgba(255, 255, 255, 0.9);
    --surface-card: rgba(255, 255, 255, 0.96);
    --surface-hover: #ffffff;
    --sidebar-bg: rgba(255, 255, 255, 0.94);
    --border: rgba(226, 232, 240, 0.9);
    --border-hover: rgba(99, 91, 255, 0.4);

    --text: #171923;
    --muted: #64748b;
    --heading-color: #0f172a;
    --welcome-color: #4f46e5;
    --welcome-glow: rgba(79, 70, 229, 0.2);

    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    --input-text: #0f172a;

    --stat-blue-bg: #ecebff;
    --stat-orange-bg: #fff4df;
    --stat-green-bg: #e5f8f1;
    --stat-purple-bg: #f0eaff;
}

[hidden] {
    display: none !important;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Inter", sans-serif;
    background: var(--background);
    color: var(--text);
    overflow-x: hidden;
    transition: var(--theme-trans);
}

button, input, textarea, select {
    font: inherit;
}

button {
    cursor: pointer;
}

/* ==========================================
   THREE.JS 3D CANVAS & Z-INDEX LAYERING
========================================== */

#spaceCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.5s ease;
}

body.light-theme #spaceCanvas {
    opacity: 1;
}

/* ==========================================
   SPACE LANDING CINEMATIC HUD OVERLAY
========================================== */

.space-landing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, rgba(7, 10, 24, 0.92) 0%, rgba(3, 5, 14, 0.98) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.5s ease;
}

.space-landing-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.landing-hud {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 520px;
    width: 90%;
    padding: 36px 30px;
    position: relative;
    z-index: 9999;
}

.hud-scanner-ring {
    width: 92px;
    height: 92px;
    border: 2px dashed rgba(0, 242, 254, 0.85);
    border-radius: 50%;
    margin-bottom: 24px;
    position: relative;
    animation: hudRadarSpin 4s linear infinite;
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.3), inset 0 0 20px rgba(0, 242, 254, 0.15);
}

.hud-scanner-ring::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #635bff 0%, #00f2fe 100%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 16px #00f2fe;
}

@keyframes hudRadarSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hud-telemetry {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.hud-tag {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 2.5px;
    color: #00f2fe;
    text-transform: uppercase;
    margin-bottom: 12px;
    text-shadow: 0 0 12px rgba(0, 242, 254, 0.7);
}

#hudStatusText {
    font-size: 18px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 22px;
    text-shadow: 0 0 16px rgba(255, 255, 255, 0.6);
    min-height: 24px;
}

.hud-progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid rgba(0, 242, 254, 0.35);
    margin-bottom: 12px;
}

.hud-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #635bff 0%, #00f2fe 100%);
    border-radius: 6px;
    box-shadow: 0 0 14px #00f2fe;
    transition: width 0.15s ease-out;
}

.hud-coords {
    font-size: 14px;
    font-weight: 700;
    color: #00f2fe;
    letter-spacing: 1px;
    font-family: monospace;
}

/* Custom Glassmorphic Scrollbars */
::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(99, 91, 255, 0.3);
    border-radius: 10px;
    border: 1px solid transparent;
    background-clip: content-box;
    transition: background 0.2s ease;
}

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

body.light-theme ::-webkit-scrollbar-thumb {
    background: rgba(99, 91, 255, 0.4);
}

.app {
    display: flex;
    height: 100vh;
    max-height: 100vh;
    overflow: hidden;
    position: relative;
    z-index: 10;
    perspective: 1400px;
    transform-style: preserve-3d;
    background: transparent;
    transition: filter 0.5s ease;
}

.app.landing-in-progress {
    pointer-events: none;
    filter: blur(4px);
}

.app.landed {
    filter: blur(0px);
}

/* ==========================================
   SIDEBAR (FIXED TO SCREEN, Z-INDEX: 100)
========================================== */

.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 100;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1), transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease, var(--theme-trans);
}

.brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4px;
    margin-bottom: 35px;
    font-size: 20px;
    font-weight: 800;
    color: var(--heading-color);
    gap: 8px;
}

.brand-left {
    display: flex;
    align-items: center;
    gap: 11px;
    min-width: 0;
    overflow: hidden;
}

.brand-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity 0.2s, width 0.2s;
}

.sidebar-collapse-btn {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.sidebar-collapse-btn:hover {
    background: var(--surface-hover);
    color: var(--welcome-color);
    border-color: var(--border-hover);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* Sidebar Collapsed State */
.sidebar.collapsed {
    width: 78px;
    padding: 24px 10px;
}

.sidebar.collapsed .brand {
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.sidebar.collapsed .brand-title,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .nav-count,
.sidebar.collapsed .productivity-card {
    display: none !important;
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 12px 0;
}

.sidebar.collapsed .nav-item i {
    font-size: 18px;
    width: auto;
}

.app.sidebar-collapsed .main {
    margin-left: 78px;
    width: calc(100% - 78px);
}

.brand-icon {
    width: 35px;
    height: 35px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, #00f2fe 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    box-shadow: 0 4px 12px var(--primary-glow);
    flex-shrink: 0;
}

.nav-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin: 0 12px 12px;
}

.navigation {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item {
    text-decoration: none;
    color: var(--muted);
    padding: 12px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
    transition: 0.2s ease;
    border: 1px solid transparent;
}

.nav-item i {
    width: 18px;
    text-align: center;
}

.nav-item:hover {
    background: var(--surface-hover);
    color: var(--primary);
    border-color: var(--border-hover);
}

.nav-item.active {
    background: var(--surface-hover);
    color: var(--welcome-color);
    font-weight: 700;
    border-color: var(--border-hover);
    box-shadow: 0 2px 8px var(--primary-glow);
}

.nav-count {
    margin-left: auto;
    min-width: 24px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    background: var(--stat-blue-bg);
    color: var(--primary);
    font-size: 11px;
    font-weight: 700;
}

.sidebar-bottom {
    margin-top: auto;
}

.productivity-card {
    padding: 15px;
    border-radius: 13px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: flex;
    gap: 11px;
    transition: var(--theme-trans);
}

.productivity-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    background: var(--stat-blue-bg);
    color: var(--welcome-color);
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.productivity-card strong {
    font-size: 12px;
    color: var(--heading-color);
}

.productivity-card p {
    margin-top: 4px;
    color: var(--muted);
    font-size: 10px;
    line-height: 1.5;
}

/* ==========================================
   MAIN WORKSPACE & TOPBAR (SCROLLABLE WINDOW)
========================================== */

.main {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 35px 45px 60px;
    position: relative;
    z-index: 20;
    scroll-behavior: smooth;
    transition: margin-left 0.3s cubic-bezier(0.16, 1, 0.3, 1), width 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    position: relative;
    z-index: 150;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 16px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.2s ease;
}

.mobile-menu-btn:hover {
    border-color: var(--border-hover);
    color: var(--welcome-color);
    box-shadow: 0 0 12px var(--primary-glow);
}

/* Mobile Sidebar Backdrop */
.sidebar-mobile-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(3, 7, 20, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sidebar-mobile-backdrop.active {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.welcome {
    color: var(--welcome-color) !important;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.3px;
    margin-bottom: 5px;
    text-shadow: 0 0 14px var(--welcome-glow);
    transition: var(--theme-trans);
}

.topbar h1 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.8px;
    color: var(--heading-color) !important;
    text-shadow: 0 2px 14px rgba(0, 0, 0, 0.4);
    transition: var(--theme-trans);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 160;
}

/* Auth Status Bar Buttons */
.login-trigger-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: 0.2s ease;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.login-trigger-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--primary-glow);
}

.icon-button {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    background: var(--surface);
    backdrop-filter: blur(8px);
    border-radius: 10px;
    color: var(--muted);
    transition: 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    border-color: var(--border-hover);
    color: var(--welcome-color);
    box-shadow: 0 0 12px var(--primary-glow);
}

/* Theme Toggle Button */
.theme-toggle-btn {
    color: #f59e0b;
    border-color: var(--border);
    background: var(--surface);
    font-size: 15px;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s ease;
}

.theme-toggle-btn:hover {
    transform: rotate(25deg) scale(1.08);
    color: #ffb703;
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.4);
}

body.light-theme .theme-toggle-btn {
    color: #4f46e5;
}

/* ==========================================
   USER AVATAR & DROPDOWN MENU (Z-INDEX: 1200)
========================================== */

.profile-dropdown-wrapper {
    position: relative;
    display: inline-block;
    z-index: 170;
}

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    padding: 6px 14px 6px 6px;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.user-avatar-btn:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    box-shadow: 0 4px 16px var(--primary-glow);
}

.user-avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, #00f2fe 100%);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    box-shadow: 0 2px 8px var(--primary-glow);
}

.user-name-display {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dropdown-arrow {
    font-size: 11px;
    color: var(--muted);
    transition: transform 0.2s ease;
}

.profile-dropdown-wrapper.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu Popup */
.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 240px;
    background: var(--surface-card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 14px;
    border: 1px solid var(--border);
    box-shadow: 0 16px 40px -4px rgba(0, 0, 0, 0.35), 0 0 1px var(--primary);
    padding: 8px;
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.97);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.profile-dropdown-wrapper.active .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-user-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 10px 12px;
}

.dropdown-avatar-circle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--stat-blue-bg);
    color: var(--welcome-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    flex-shrink: 0;
}

.dropdown-user-details {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.dropdown-user-details strong {
    font-size: 13px;
    font-weight: 700;
    color: var(--heading-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dropdown-user-details span {
    font-size: 11px;
    color: var(--muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

.dropdown-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.15s ease;
}

.dropdown-item i {
    font-size: 14px;
    color: var(--muted);
    width: 16px;
    text-align: center;
}

.dropdown-item:hover {
    background: var(--surface-hover);
    color: var(--welcome-color);
}

.dropdown-item:hover i {
    color: var(--welcome-color);
}

.dropdown-item.signout-item:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--red);
}

.dropdown-item.signout-item:hover i {
    color: var(--red);
}

/* ==========================================
   STATISTICS (Z-INDEX: 20)
========================================== */

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 25px;
    position: relative;
    z-index: 20;
}

.stat-card {
    background: var(--surface-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    transform-style: preserve-3d;
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.1);
    transition: var(--theme-trans), transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.stat-card:hover {
    transform: translateY(-4px) translateZ(15px);
    border-color: var(--border-hover);
    box-shadow: 0 16px 32px -6px var(--primary-glow);
}

.stat-icon {
    width: 43px;
    height: 43px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-icon.blue { background: var(--stat-blue-bg); color: #00f2fe; }
.stat-icon.orange { background: var(--stat-orange-bg); color: var(--orange); }
.stat-icon.green { background: var(--stat-green-bg); color: var(--green); }
.stat-icon.purple { background: var(--stat-purple-bg); color: #c084fc; }

.stat-card span {
    display: block;
    color: var(--muted);
    font-size: 12px;
    margin-bottom: 4px;
    font-weight: 500;
}

.stat-card strong {
    font-size: 22px;
    font-weight: 800;
    color: var(--heading-color);
}

/* ==========================================
   CONTENT GRID & FORMS (Z-INDEX: 20)
========================================== */

.content-grid {
    display: grid;
    grid-template-columns: minmax(330px, 0.8fr) minmax(500px, 1.5fr);
    gap: 22px;
    align-items: start;
    position: relative;
    z-index: 20;
}

.task-form-card,
.tasks-card {
    background: var(--surface-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.15);
    transform-style: preserve-3d;
    transition: var(--theme-trans);
}

.section-heading,
.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 25px;
}

.eyebrow {
    color: var(--welcome-color);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 1.2px;
    text-transform: uppercase;
}

.section-heading h2,
.tasks-header h2 {
    font-size: 20px;
    font-weight: 800;
    margin-top: 5px;
    color: var(--heading-color);
}

.section-heading p {
    color: var(--muted);
    font-size: 12px;
}

.heading-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--stat-blue-bg);
    color: var(--welcome-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Forms & Inputs */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    padding: 12px 14px;
    color: var(--input-text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--welcome-color);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.add-task-btn {
    width: 100%;
    padding: 13px;
    background: linear-gradient(135deg, var(--primary) 0%, #00f2fe 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 6px 20px var(--primary-glow);
    margin-top: 10px;
}

.add-task-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
}

/* Search Box & Filters */
.search-box {
    position: relative;
    margin-bottom: 16px;
}

.search-box i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
}

.search-box input {
    width: 100%;
    padding: 11px 14px 11px 40px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--input-text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box input:focus {
    border-color: var(--welcome-color);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.filter-button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    transition: 0.2s;
}

.filter-button:hover {
    border-color: var(--red);
    color: var(--red);
    background: rgba(239, 68, 68, 0.1);
}

.filters {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.filter {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    padding: 7px 14px;
    border-radius: 20px;
    white-space: nowrap;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter:hover {
    border-color: var(--border-hover);
    color: var(--welcome-color);
    background: var(--surface-hover);
}

.filter.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 2px 8px var(--primary-glow);
}

/* ==========================================
   TASK LIST & 3D DRAGGABLE CARDS
========================================== */

.task-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 50px;
}

.task-card {
    cursor: grab;
    transform-style: preserve-3d;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease, var(--theme-trans);
    position: relative;
    background: var(--surface-card);
    backdrop-filter: blur(14px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    user-select: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.task-card:hover {
    transform: translateY(-2px) translateZ(8px);
    border-color: var(--border-hover);
    box-shadow: 0 8px 20px var(--primary-glow);
}

.task-card.completed {
    opacity: 0.75;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: var(--muted);
}

.task-card.is-dragging {
    cursor: grabbing !important;
    z-index: 1000 !important;
    transform: translateZ(40px) scale(1.025) !important;
    border-color: #00f2fe !important;
    box-shadow: 0 20px 40px rgba(0, 242, 254, 0.25), 0 0 18px var(--primary-glow) !important;
    opacity: 0.95;
}

.task-drop-placeholder {
    height: 90px;
    border: 2px dashed rgba(0, 242, 254, 0.7);
    border-radius: 12px;
    background: rgba(0, 242, 254, 0.08);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #00f2fe;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    animation: pulseGuide 1s infinite alternate;
}

@keyframes pulseGuide {
    from { opacity: 0.5; border-color: rgba(0, 242, 254, 0.4); }
    to { opacity: 1; border-color: rgba(0, 242, 254, 0.9); }
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.task-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.task-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

.task-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--heading-color);
}

.task-badges {
    display: flex;
    gap: 6px;
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

.badge.priority-low { background: var(--stat-green-bg); color: var(--green); }
.badge.priority-medium { background: var(--stat-orange-bg); color: var(--orange); }
.badge.priority-high { background: rgba(239, 68, 68, 0.2); color: var(--red); }
.badge.category { background: var(--stat-blue-bg); color: var(--welcome-color); }

.task-description {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 14px;
    line-height: 1.5;
}

.task-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--muted);
}

.task-dates {
    display: flex;
    gap: 12px;
}

.task-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-edit {
    background-color: transparent;
    color: var(--welcome-color);
    border: 1px solid transparent;
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-edit:hover {
    background: var(--stat-blue-bg);
    border-color: var(--border-hover);
}

.btn-delete {
    background-color: transparent;
    color: var(--muted);
    border: 1px solid transparent;
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-delete:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--red);
    border-color: rgba(239, 68, 68, 0.3);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--muted);
}

.empty-icon {
    font-size: 40px;
    margin-bottom: 12px;
    color: var(--welcome-color);
    opacity: 0.8;
}

/* ==========================================
   OCEAN COLOR WAVE TRANSITION ANIMATION
========================================== */

.ocean-wave-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9990;
    opacity: 0;
    background: radial-gradient(circle at var(--wave-x, 80%) var(--wave-y, 30px), 
        rgba(0, 242, 254, 0.7) 0%, 
        rgba(99, 91, 255, 0.5) 30%, 
        rgba(0, 210, 255, 0.2) 65%, 
        transparent 90%);
    mix-blend-mode: screen;
    transition: opacity 0.3s ease;
}

.ocean-wave-overlay.active {
    opacity: 1;
}

/* Ocean wave surge animation on each UI section as the wave sweeps past */
.ocean-wave-hit {
    animation: oceanWaveSurge 0.75s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes oceanWaveSurge {
    0% {
        box-shadow: 0 0 0 rgba(0, 242, 254, 0);
        transform: scale(0.985);
    }
    40% {
        box-shadow: 0 0 32px rgba(0, 242, 254, 0.65), 0 0 16px rgba(99, 91, 255, 0.5);
        border-color: rgba(0, 242, 254, 0.95);
        transform: scale(1.02);
    }
    100% {
        transform: scale(1);
    }
}

/* ==========================================
   MODALS & POPUPS (Z-INDEX: 9999)
========================================== */

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(4, 7, 20, 0.65);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s;
    padding: 20px;
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background: var(--surface-card);
    backdrop-filter: blur(28px);
    border-radius: var(--radius);
    width: 100%;
    max-width: 440px;
    padding: 36px 32px;
    border: 1px solid var(--border);
    box-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.4), 0 0 1px var(--primary);
    position: relative;
    transform: scale(0.92) translateY(10px);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), var(--theme-trans);
}

.modal-backdrop.active .modal-card {
    transform: scale(1) translateY(0);
}

.modal-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: 0.2s ease;
}

.modal-close-btn:hover {
    background: var(--surface-hover);
    color: var(--welcome-color);
    border-color: var(--border-hover);
}

.modal-header {
    text-align: center;
    margin-bottom: 24px;
}

.modal-logo-icon {
    width: 48px;
    height: 48px;
    background: var(--stat-blue-bg);
    color: var(--welcome-color);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin: 0 auto 14px;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.modal-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--heading-color);
}

.modal-subtitle {
    font-size: 13px;
    color: var(--muted);
    margin-top: 4px;
}

/* User Profile Modal */
.profile-modal-card {
    max-width: 460px;
}

.user-profile-icon {
    background: var(--stat-blue-bg);
    color: var(--welcome-color);
    font-size: 24px;
}

.profile-info-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    margin-top: 8px;
}

.profile-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.profile-info-row:last-child {
    border-bottom: none;
}

.profile-info-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-weight: 500;
}

.profile-info-label i {
    width: 16px;
    color: var(--welcome-color);
    text-align: center;
}

.profile-info-value {
    color: var(--heading-color);
    font-weight: 600;
    text-align: right;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.input-wrapper {
    position: relative;
}

.input-icon-left {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
}

.input-wrapper input {
    width: 100%;
    padding-left: 40px !important;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    font-size: 12px;
}

.form-options a {
    color: var(--welcome-color);
    text-decoration: none;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 20px 0;
    color: var(--muted);
    font-size: 12px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border);
}

.divider span {
    padding: 0 10px;
}

.social-btns {
    display: flex;
    gap: 12px;
}

.btn-social {
    flex: 1;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: 0.2s ease;
}

.btn-social:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    color: var(--welcome-color);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--surface-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--welcome-color);
    box-shadow: 0 8px 24px rgba(0, 242, 254, 0.25);
    color: var(--text);
    padding: 14px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 600;
    z-index: 10000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.toast i {
    color: #00f2fe;
}

/* ==========================================
   RESPONSIVE DESIGN (TABLETS & MOBILE)
========================================== */

@media (max-width: 1100px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

@media (max-width: 900px) {
    .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }
    .main {
        padding: 24px 24px 50px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .sidebar-collapse-btn {
        display: none !important;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 270px !important;
        transform: translateX(-100%);
        z-index: 1050;
        box-shadow: 12px 0 40px rgba(0, 0, 0, 0.5);
    }

    .sidebar.mobile-open {
        transform: translateX(0) !important;
    }

    .main {
        margin-left: 0 !important;
        width: 100% !important;
        padding: 20px 16px 60px;
    }

    .topbar {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
        margin-bottom: 24px;
    }

    .topbar-left {
        display: flex;
        align-items: center;
        justify-content: flex-start;
        gap: 14px;
    }

    .header-actions {
        justify-content: flex-end;
        width: 100%;
    }

    .topbar h1 {
        font-size: 22px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .task-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .task-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 6px;
    }

    .task-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

@media (max-width: 520px) {
    .stats {
        grid-template-columns: 1fr;
    }

    .modal-card {
        padding: 26px 18px;
    }

    .modal-title {
        font-size: 19px;
    }
}