:root {
    --bg-gradient: linear-gradient(135deg, #F4F6FA 0%, #E2E8F0 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(108, 92, 231, 0.1);
    --text-color: #1a1a1a;
    --primary: #a29bfe; /* Neon Purple */
    --secondary: #6c5ce7;
    --danger: #ff7675;
    --success: #00b894;

    /* New Gradient Variables for Buttons */
    --primary-btn-gradient-start: #a29bfe; /* Neon Purple */
    --primary-btn-gradient-end: #00e0ff;   /* Electric Blue/Cyan */
    --calm-btn-gradient-start: #00b894;    /* Teal Green */
    --calm-btn-gradient-end: #00cec9;      /* Cyan */

    /* Subject & Topic Colors */
    --subject-chip-bg: rgba(108, 92, 231, 0.15);
    --topic-tag-bg: rgba(0, 184, 148, 0.15);
}

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

body {
    background: transparent; /* Make transparent to show Vanta BG */
    min-height: 100vh;
    color: var(--text-color);
    overflow-x: hidden;
    transition: background 0.5s ease;
    perspective: 1000px;
    overflow-y: auto;
}

[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #0B0F1A 0%, #16213e 100%);
    --glass-bg: rgba(10, 10, 15, 0.7);
    --glass-border: rgba(162, 155, 254, 0.15);
    --text-color: #e0e0e0;
}

/* Disable custom cursor on touch devices for better UX */
@media (pointer: coarse) {
    .dragon-ball, .dragon-segment { display: none !important; }
}

body.custom-cursor-active {
    cursor: none;
}

/* Dragon Cursor */
.dragon-ball {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #ff7675;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px #ff7675;
    z-index: 10000;
    pointer-events: none;
}

.dragon-segment {
    position: absolute;
    width: 15px;
    height: 15px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    pointer-events: none;
}

/* Vanta Background */
#vanta-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

/* Glassmorphism Classes */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    transform-style: preserve-3d; /* Allows children to pop out */
}

/* Auth Section */
.center-panel {
    max-width: 400px;
    margin: 10vh auto;
    text-align: center;
    transition: transform 0.1s ease-out;
}
.auth-forms input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-color);
    box-shadow: none;
    transition: 0.3s ease;
}

.auth-forms input:focus {
    background: rgba(0, 0, 0, 0.4);
    border-color: var(--primary);
}

/* Dashboard Layout */
.glass-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
}

.main-layout {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 15px;
    padding-bottom: 100px; /* Space for bottom nav */
}

/* Typography Scaling */
h1 { font-size: clamp(1.8rem, 8vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 5vw, 1.5rem); }

/* Mobile Bottom Nav */
.bottom-nav {
    display: flex;
    justify-content: space-around;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    padding: 12px 0;
    border-top: 1px solid var(--glass-border);
    z-index: 2000;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.2);
}

.nav-btn {
    background: none;
    border: none;
    color: #888;
    font-size: 1.1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
    transition: 0.3s;
}

.nav-btn.active {
    color: var(--primary);
    transform: translateY(-2px);
}

.nav-btn span { font-size: 0.65rem; font-weight: 600; }

/* Mobile View Toggling */
.mobile-hidden { display: none !important; }

@media (min-width: 769px) {
    .main-layout { display: grid; grid-template-columns: 320px 1fr; max-width: 1300px; margin: 0 auto; padding: 30px; }
    .sidebar { display: block !important; }
    .bottom-nav { display: none; }
    .mobile-hidden { display: block !important; }
}

/* Exam Mode */

/* XP Bar */
.xp-container { display: flex; align-items: center; gap: 10px; margin-left: 20px; }
.xp-bar-bg { width: 100px; height: 8px; background: rgba(0,0,0,0.1); border-radius: 4px; overflow: hidden; }
#xp-bar-fill { height: 100%; background: var(--primary); transition: width 0.3s; }
#level-display { font-weight: bold; font-size: 0.9rem; }

/* Input Group 3D */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 25px;
}

.input-group input, .input-group select {
    width: 100%;
    min-height: 48px; /* Touch friendly */
    padding: 0 15px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-color);
    font-size: 16px; /* Prevents iOS zoom on focus */
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary);
    background: rgba(0, 0, 0, 0.4);
}
.input-group input[type="text"] { flex: 2; min-width: 200px; }
.input-group-mini { display: flex; gap: 5px; margin-top: 10px; }

@media (min-width: 769px) {
    .input-group { flex-direction: row; flex-wrap: wrap; }
    .input-group input, .input-group select { width: auto; flex: 1; }
    .input-group input[type="text"] { flex: 3; }
}

/* Task List */
.task-item {
    background: var(--glass-bg);
    margin-bottom: 12px;
    padding: 15px;
    border-radius: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
    border: 1px solid var(--glass-border);
    border-left: 5px solid transparent;
    transition: transform 0.2s;
}

.task-item:active { transform: scale(0.98); }
.task-item.priority-high { border-left-color: var(--danger); background: linear-gradient(to right, rgba(255, 118, 117, 0.05), transparent); }
.task-item.priority-medium { border-left-color: #fdcb6e; background: linear-gradient(to right, rgba(253, 203, 110, 0.05), transparent); }
.task-item.priority-low { border-left-color: var(--success); background: linear-gradient(to right, rgba(0, 184, 148, 0.05), transparent); }

.completed-task-text { text-decoration: line-through; opacity: 0.7; }
.task-meta { display: flex; gap: 8px; margin-top: 5px; flex-wrap: wrap; }
.tag-chip {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 12px;
    background: rgba(108, 92, 231, 0.2);
    color: var(--primary);
    border: 1px solid rgba(108, 92, 231, 0.4);
    box-shadow: 0 0 5px rgba(108, 92, 231, 0.2);
}

/* New Badge Styles for Subject and Topic */
.badge.subject-badge {
    background: var(--subject-chip-bg);
    color: var(--primary);
    border: 1px solid rgba(162, 155, 254, 0.3);
    padding: 3px 8px;
    border-radius: 8px;
    font-size: 0.75rem;
}
.badge.topic-badge {
    background: var(--topic-tag-bg);
    color: var(--success);
    border: 1px solid rgba(0, 184, 148, 0.3);
    padding: 3px 8px;
    border-radius: 8px;
    font-size: 0.75rem;
}
.task-content small { opacity: 0.7; font-size: 0.8rem; }
.actions button {
    background: none; border: none; cursor: pointer; color: var(--text-color); opacity: 0.7;
    padding: 10px; /* Larger touch area */
}
.actions button.btn-split { color: var(--primary); }
.actions button:hover { opacity: 1; }

/* Sound Buttons */
.ambient-sounds { margin-top: 15px; display: flex; gap: 10px; align-items: center; }
.btn-sound { padding: 8px 12px; background: rgba(0, 0, 0, 0.4); border: 1px solid var(--glass-border); border-radius: 50%; color: var(--text-color); }
.full-width-select { width: 100%; }
/* Wellness */
.stress-meter-container { margin: 20px 0; }
.progress-bar { width: 100%; height: 10px; background: rgba(255,255,255,0.1); border-radius: 5px; overflow: hidden; }
#stress-bar { height: 100%; transition: width 0.5s ease; background: var(--success); }

/* Breathing Modal */
.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); z-index: 100;
    display: flex; justify-content: center; align-items: center;
}
.modal-content {
    max-width: 500px;
    width: 90%;
    text-align: center;
}
.breathing-circle {
    width: 150px; height: 150px;
    background: var(--secondary);
    border-radius: 50%;
    margin: 30px auto;
    display: flex; align-items: center; justify-content: center;
    color: white;
    animation: breathAnim 19s infinite; /* 4-7-8 cycle approx */
}
@keyframes breathAnim {
    0%, 20% { transform: scale(1.5); content: "Inhale"; } /* 4s */
    20%, 55% { transform: scale(1.5); opacity: 0.8; } /* 7s hold */
    55%, 100% { transform: scale(1); opacity: 0.5; } /* 8s exhale */
}

/* 3D Sidebar and Task Area specific */
.sidebar, .task-area {
    transition: transform 0.1s ease-out;
}

/* Pop-out effects for text inside glass panels */
h1, h2, h3, h4, .logo {
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    transform: translateZ(20px);
}

/* Subjects & Topics Management Section */
.subjects-topics-management {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--glass-border);
}
.subjects-topics-management h4 {
    margin-bottom: 15px;
    color: var(--primary);
    text-align: center;
}
.subject-actions {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
}
.subjects-container, .topics-container {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    justify-content: center;
}
.subject-chip, .topic-tag {
    padding: 8px 15px;
    border-radius: 12px;
    background: var(--subject-chip-bg);
    border: 1px solid rgba(162, 155, 254, 0.3);
    color: var(--text-color);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}
/* Subject chip hover and active states */
.subject-chip:hover, .topic-tag:hover {
    background: rgba(162, 155, 254, 0.25);
    box-shadow: 0 0 10px rgba(162, 155, 254, 0.5);
    transform: translateY(-2px);
}
.subject-chip.active, .topic-tag.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary);
    /* Workload density glow for active subjects */
    box-shadow: 0 0 15px var(--primary), 0 0 25px var(--workload-glow, rgba(162, 155, 254, 0.1));
    transform: scale(1.02);
}

/* Delete button on chips/tags */
.delete-chip-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8em;
    cursor: pointer;
}
.subject-task-count { font-size: 0.75rem; opacity: 0.8; }
.empty-message { text-align: center; opacity: 0.6; font-size: 0.9rem; margin-top: 10px; }

/* Mood Tracker */
.mood-tracker {
    margin-top: 15px;
    text-align: center;
}
.mood-tracker small {
    display: block;
    margin-bottom: 5px;
    opacity: 0.8;
    font-size: 0.8rem;
}
.mood-btns {
    display: flex;
    justify-content: center;
    gap: 10px;
}
.mood-btns button {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 35px;
    height: 35px;
    padding: 0;
    font-size: 1.2rem;
    transition: 0.2s;
    box-shadow: none;
    transform: none;
}
.mood-btns button:hover {
    background: rgba(255,255,255,0.15);
    transform: scale(1.1);
}

/* --- NEW FEATURES --- */

/* Hardest Task Highlight */
.task-item.hardest-task {
    border: 1px solid var(--danger);
    box-shadow: 0 0 20px rgba(255, 118, 117, 0.15);
    transform: scale(1.02) translateZ(30px);
    z-index: 10;
    background: linear-gradient(to right, rgba(255, 118, 117, 0.08), rgba(30, 30, 40, 0.6)); /* Slightly reduced tint */
}
.task-item.hardest-task::before {
    content: "🔥 Priority Target";
    position: absolute;
    top: -10px;
    right: 10px;
    background: var(--danger);
    color: white;
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: bold;
}

/* Focus Shield (Distraction Block) */
body.focus-shield .sidebar, 
body.focus-shield .nav-actions,
body.focus-shield .filters,
body.focus-shield .input-group,
body.focus-shield .task-item:not(.hardest-task) {
    opacity: 0.1;
    pointer-events: none;
    filter: blur(4px);
    transition: all 0.8s ease;
}
body.focus-shield .pomodoro-box {
    transform: scale(1.1) translateZ(50px);
    z-index: 100;
    box-shadow: 0 0 50px rgba(108, 92, 231, 0.5);
}

/* Silent Study Room Widget */
.study-room-widget {
    margin-top: 20px;
    text-align: center;
    padding: 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}
.live-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    margin-right: 6px;
    animation: pulse 2s infinite;
}
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; } }

/* Boss Battle Bar */
.boss-battle-container {
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(0,0,0,0.8), rgba(50,50,50,0.8));
    color: white;
    border: 1px solid var(--danger);
    display: none; /* Hidden by default */
}
.boss-battle-container.active { display: block; animation: slideIn 0.5s; }
.boss-hp-bar {
    height: 15px;
    background: #444;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 8px;
    box-shadow: inset 0 0 5px rgba(0,0,0,0.5);
}
.boss-hp-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff7675, #d63031);
    width: 100%;
    transition: width 0.5s ease;
}

/* Analytics & Links */
.chart-container {
    position: relative;
    height: 200px;
    width: 100%;
    margin-top: 10px;
}
.link-list { list-style: none; margin-top: 10px; }
.link-list li {
    padding: 8px;
    background: rgba(0, 0, 0, 0.3);
    margin-bottom: 5px;
    border-radius: 8px;
    display: flex; justify-content: space-between; align-items: center;
}
.link-list a { color: var(--primary); text-decoration: none; }

.hidden { display: none !important; }

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}
.shake {
    animation: shake 0.3s ease-in-out;
    border: 2px solid var(--danger) !important;
}

/* Scrollbar aesthetics */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(162, 155, 254, 0.2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(162, 155, 254, 0.4); }
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    transform: translateZ(30px);
}


/* Buttons & Inputs (Consolidated and Enhanced) */
button {
    min-height: 48px;
    padding: 0 24px;
    border-radius: 14px;
    border: none;
    cursor: pointer;
    font-weight: 600; /* Medium-bold text */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2); /* Added for better contrast */
    outline: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

/* Primary Buttons */
.btn-primary, #add-task-btn, #login-btn, .btn-google {
    background: linear-gradient(135deg, var(--primary-btn-gradient-start) 0%, var(--primary-btn-gradient-end) 100%); /* Bright accent gradient */
    box-shadow: 0 4px 15px rgba(0, 224, 255, 0.3); /* Soft glow, matching new end color */
}

.btn-primary:hover, #add-task-btn:hover, #login-btn:hover, .btn-google:hover {
    transform: scale(1.05) translateY(-2px) translateZ(20px); /* Slight scale-up */
    box-shadow: 0 8px 25px rgba(0, 224, 255, 0.5); /* Glow intensifies */
}

.btn-primary:active, #add-task-btn:active, #login-btn:active, .btn-google:active {
    transform: scale(0.98) translateY(1px) translateZ(5px); /* Soft click feedback */
    box-shadow: inset 2px 2px 8px rgba(0,0,0,0.3), 0 2px 5px rgba(0, 224, 255, 0.2);
}

/* Secondary Buttons / Filters */
.btn-secondary, .filter-btn, #signup-btn, #close-breath, .timer-controls button {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.btn-secondary:hover, .filter-btn:hover, #signup-btn:hover, #close-breath:hover, .timer-controls button:hover {
    background: rgba(40, 40, 50, 0.6); /* Replaced white overlay with dark transparent tone */
    border-color: var(--primary); /* Thin glowing border in accent color */
    box-shadow: 0 0 15px rgba(162, 155, 254, 0.2); /* Subtle glow */
    transform: translateY(-2px) translateZ(15px); /* Hover micro-interaction */
}

.btn-secondary:active, .filter-btn:active, #signup-btn:active, #close-breath:active, .timer-controls button:active {
    transform: scale(0.98) translateY(1px) translateZ(5px);
    box-shadow: inset 2px 2px 8px rgba(0,0,0,0.3); /* Soft click feedback */
}

.filter-btn.active {
    background: var(--secondary);
    border-color: var(--secondary); /* Active state glowing border */
    box-shadow: 0 0 20px rgba(108, 92, 231, 0.4); /* Active state glowing */
    color: #fff;
}

/* Tertiary / Utility Buttons */
#logout-btn, .btn-sound, .actions button, .btn-small {
    background: transparent;
    border: none;
    box-shadow: none;
    transform: none;
    opacity: 0.7;
    padding: 8px;
    color: var(--text-color);
}
#logout-btn:hover, .btn-sound:hover, .actions button:hover, .btn-small:hover {
    opacity: 1;
    color: var(--primary);
    transform: scale(1.1) translateZ(15px);
    text-shadow: 0 0 10px var(--primary);
}

/* Theme Switch Premium Redesign */
.theme-switch {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    outline: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-right: 15px;
}

.theme-switch:hover { transform: translateY(-1px); }
.theme-switch:active { transform: scale(0.95); }

.switch-track {
    width: 54px;
    height: 28px;
    border-radius: 20px;
    position: relative;
    padding: 3px;
    transition: all 0.4s ease;
    box-shadow: inset 2px 2px 6px rgba(0, 0, 0, 0.3), inset -1px -1px 3px rgba(255, 255, 255, 0.05);
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
}

.switch-knob {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.4s ease, box-shadow 0.4s ease;
    z-index: 2;
}

.switch-knob i { font-size: 11px; position: absolute; transition: opacity 0.3s ease, transform 0.3s ease; }

[data-theme="dark"] .switch-track { background: linear-gradient(145deg, #020617, #1e293b); }
[data-theme="dark"] .switch-knob { transform: translateX(26px); background: linear-gradient(145deg, #a29bfe, #6c5ce7); box-shadow: 0 0 12px rgba(162, 155, 254, 0.6), inset 1px 1px 2px rgba(255, 255, 255, 0.3); }
[data-theme="dark"] .icon-light { opacity: 0; transform: scale(0.5) rotate(-45deg); }
[data-theme="dark"] .icon-dark { opacity: 1; transform: scale(1) rotate(0); color: #fff; }

[data-theme="light"] .switch-track { background: linear-gradient(145deg, #e2e8f0, #f8fafc); box-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.1), inset -2px -2px 5px rgba(255, 255, 255, 0.8); }
[data-theme="light"] .switch-knob { transform: translateX(0); background: linear-gradient(145deg, #ffcc33, #ffb347); box-shadow: 0 0 12px rgba(255, 204, 51, 0.5), inset 1px 1px 2px rgba(255, 255, 255, 0.5); }
[data-theme="light"] .icon-dark { opacity: 0; transform: scale(0.5) rotate(45deg); }
[data-theme="light"] .icon-light { opacity: 1; transform: scale(1) rotate(0); color: #fff; }

/* Special Enhancements */
#exam-mode-btn.btn-primary { /* Ensure primary button styles are applied */
    background: linear-gradient(135deg, #2d3436 0%, #000000 100%);
    border: 1px solid var(--secondary);
    box-shadow: 0 4px 15px rgba(0, 210, 211, 0.2);
}

#breathe-btn {
    background: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}

/* Pulse Animation for Empty State CTA */
@keyframes neonPulse {
    0% { box-shadow: 0 0 5px var(--primary); }
    50% { box-shadow: 0 0 20px var(--primary), 0 0 30px var(--secondary); }
    100% { box-shadow: 0 0 5px var(--primary); }
}

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

/* Sound Buttons */
/* .ambient-sounds { margin-top: 15px; display: flex; gap: 10px; align-items: center; } */ /* Consolidated below */