/* ===================================
   Focus Study Dashboard - Styles
   Modern, Premium Design with Dark Mode
   =================================== */

/* ===================================
   CSS Variables (Design Tokens)
   =================================== */
:root {
    /* Colors - Light Mode */
    --color-primary: hsl(220, 90%, 56%);
    --color-primary-dark: hsl(220, 90%, 46%);
    --color-primary-light: hsl(220, 90%, 96%);

    --color-success: hsl(142, 71%, 45%);
    --color-success-light: hsl(142, 71%, 95%);

    --color-warning: hsl(38, 92%, 50%);
    --color-warning-light: hsl(38, 92%, 95%);

    --color-danger: hsl(4, 90%, 58%);
    --color-danger-light: hsl(4, 90%, 95%);

    --color-purple: hsl(270, 70%, 60%);
    --color-purple-light: hsl(270, 70%, 95%);

    /* Neutral Colors - Light Mode */
    --color-bg: hsl(220, 25%, 97%);
    --color-surface: hsl(0, 0%, 100%);
    --color-text: hsl(220, 20%, 15%);
    --color-text-secondary: hsl(220, 15%, 45%);
    --color-border: hsl(220, 15%, 90%);
    --color-divider: hsl(220, 15%, 93%);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --color-bg: hsl(220, 15%, 10%);
    --color-surface: hsl(220, 13%, 15%);
    --color-text: hsl(220, 15%, 95%);
    --color-text-secondary: hsl(220, 10%, 65%);
    --color-border: hsl(220, 13%, 25%);
    --color-divider: hsl(220, 13%, 20%);

    --color-primary-light: hsl(220, 90%, 20%);
    --color-success-light: hsl(142, 60%, 20%);
    --color-warning-light: hsl(38, 80%, 20%);
    --color-danger-light: hsl(4, 80%, 20%);
    --color-purple-light: hsl(270, 60%, 20%);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
}

/* ===================================
   Base Styles
   =================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color var(--transition-slow), color var(--transition-slow);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
}

h3 {
    font-size: 1.25rem;
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   Header
   =================================== */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.logo h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* ===================================
   Dashboard Stats
   =================================== */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border: 1px solid var(--color-border);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-icon-blue {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.stat-icon-green {
    background: var(--color-success-light);
    color: var(--color-success);
}

.stat-icon-orange {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.stat-icon-purple {
    background: var(--color-purple-light);
    color: var(--color-purple);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text);
}

.stat-sublabel {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-purple));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* ===================================
   Daily Goals Section
   =================================== */
.daily-goals-section {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.goals-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.goals-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.goals-title svg {
    width: 28px;
    height: 28px;
    color: var(--color-success);
}

.goals-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-left: 36px;
}

.goal-form {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.goal-form.hidden {
    display: none;
}

.goals-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.goal-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.goal-item:hover {
    border-color: var(--color-border);
    transform: translateX(2px);
}

.goal-item.completed {
    opacity: 0.6;
}

.goal-item.completed .goal-text {
    text-decoration: line-through;
}

.goal-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-success);
}

.goal-text {
    flex: 1;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.goal-delete {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.goal-delete svg {
    width: 16px;
    height: 16px;
}

.goal-delete:hover {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

.empty-state-small {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-secondary);
}

.empty-state-small p {
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

/* ===================================
   AI Insights Section
   =================================== */
.ai-insights-section {
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg));
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}

.ai-insights-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-purple));
}

.insights-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.insights-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.insights-title svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.ai-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: white;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
}

.insight-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

.insight-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.insight-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.insight-icon svg {
    width: 24px;
    height: 24px;
}

.insight-icon-blue {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.insight-icon-purple {
    background: var(--color-purple-light);
    color: var(--color-purple);
}

.insight-icon-green {
    background: var(--color-success-light);
    color: var(--color-success);
}

.insight-icon-orange {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.insight-content {
    flex: 1;
    min-width: 0;
}

.insight-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.insight-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.insight-detail {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* Voice Status */
.voice-status {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 100;
    min-height: 60px;
}

.voice-status.hidden {
    display: none !important;
}

.voice-animation {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.voice-animation span {
    width: 4px;
    height: 20px;
    background: white;
    border-radius: 2px;
    animation: voice-wave 0.8s ease-in-out infinite;
}

.voice-animation span:nth-child(2) {
    animation-delay: 0.2s;
}

.voice-animation span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes voice-wave {

    0%,
    100% {
        transform: scaleY(0.4);
    }

    50% {
        transform: scaleY(1);
    }
}

.voice-text {
    font-size: 0.9375rem;
    font-weight: 600;
    color: white;
}

/* Voice button active state */
.btn-icon.voice-active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* Voice Commands Help Section */
.voice-help-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--color-border);
}

.voice-help-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--color-text);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-md);
}

.voice-help-toggle:hover {
    background: var(--color-bg);
}

.voice-help-toggle svg:first-child {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.voice-help-toggle .chevron {
    width: 18px;
    height: 18px;
    margin-left: auto;
    transition: transform var(--transition-base);
}

.voice-help-toggle.active .chevron {
    transform: rotate(180deg);
}

.voice-help-content {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.voice-help-content.hidden {
    display: none;
}

.voice-help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.voice-help-category h4 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.voice-help-category ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.voice-help-category li {
    padding: 0.375rem 0;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.voice-help-category code {
    background: var(--color-bg);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--color-primary);
}

.voice-help-tip {
    background: var(--color-primary-light);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    border-left: 3px solid var(--color-primary);
}

.voice-help-tip strong {
    color: var(--color-primary);
}

/* ===================================
   Main Grid
   =================================== */
.main-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-lg);
}

/* ===================================
   Card Component
   =================================== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

/* ===================================
   Timer Card
   =================================== */
.timer-card {
    grid-column: span 12;
}

@media (min-width: 768px) {
    .timer-card {
        grid-column: span 6;
    }
}

@media (min-width: 1024px) {
    .timer-card {
        grid-column: span 4;
    }
}

.timer-mode-toggle {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    background: var(--color-bg);
    padding: 0.25rem;
    border-radius: var(--radius-md);
}

.mode-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.mode-btn svg {
    width: 16px;
    height: 16px;
}

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

.mode-btn.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.timer-display {
    position: relative;
    width: 220px;
    height: 220px;
    margin: 0 auto var(--spacing-xl);
}

.timer-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-ring-bg {
    fill: none;
    stroke: var(--color-border);
    stroke-width: 8;
}

.timer-ring-progress {
    fill: none;
    stroke: url(#timerGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 534.07;
    /* 2 * PI * 85 */
    stroke-dashoffset: 534.07;
    transition: stroke-dashoffset 1s linear;
}

.timer-time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text);
}

.timer-label {
    position: absolute;
    bottom: 25%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.timer-settings {
    margin-bottom: var(--spacing-lg);
}

.timer-settings label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.timer-subject {
    margin-bottom: var(--spacing-lg);
}

.timer-subject label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.timer-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.timer-interruptions {
    text-align: center;
}

/* ===================================
   Charts Card
   =================================== */
.charts-card {
    grid-column: span 12;
}

@media (min-width: 768px) {
    .charts-card {
        grid-column: span 6;
    }
}

@media (min-width: 1024px) {
    .charts-card {
        grid-column: span 8;
    }
}

.chart-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.chart-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.chart-tab:hover {
    color: var(--color-text);
}

.chart-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Session Stats with Delete Button */
.session-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-icon-small {
    width: 32px;
    height: 32px;
    padding: 0.375rem;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon-small svg {
    width: 16px;
    height: 16px;
}

.btn-delete-session:hover {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
    transform: scale(1.05);
}

.btn-danger {
    color: var(--color-danger);
}

.btn-danger:hover {
    background: var(--color-danger);
    color: white;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.card-header .card-title {
    margin-bottom: 0;
}

.chart-container {
    position: relative;
    height: 300px;
    margin-bottom: var(--spacing-lg);
}

.chart {
    max-height: 300px;
}

.chart.hidden {
    display: none;
}

/* ===================================
   Exams Card
   =================================== */
.exams-card {
    grid-column: span 12;
}

@media (min-width: 1024px) {
    .exams-card {
        grid-column: span 6;
    }
}

.exam-form {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.exam-form.hidden {
    display: none;
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.exams-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.exam-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-primary);
    transition: all var(--transition-base);
}

.exam-item:hover {
    transform: translateX(4px);
}

.exam-item.priority-high {
    border-left-color: var(--color-danger);
}

.exam-item.priority-medium {
    border-left-color: var(--color-warning);
}

.exam-item.priority-low {
    border-left-color: var(--color-success);
}

.exam-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.exam-subject {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
}

.exam-countdown {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.exam-date {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.exam-tasks {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.exam-task {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.exam-task input[type="checkbox"] {
    cursor: pointer;
}

.exam-task.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

.exam-actions {
    margin-top: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
}

/* ===================================
   History Card
   =================================== */
.history-card {
    grid-column: span 12;
}

@media (min-width: 1024px) {
    .history-card {
        grid-column: span 6;
    }
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.session-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-base);
}

.session-item:hover {
    transform: translateX(4px);
}

.session-info {
    flex: 1;
}

.session-subject {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.session-time {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.session-duration {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-primary);
    margin-right: var(--spacing-md);
}

.session-focus {
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.session-focus.high {
    background: var(--color-success-light);
    color: var(--color-success);
}

.session-focus.medium {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.session-focus.low {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

/* ===================================
   Empty State
   =================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--color-text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    opacity: 0.3;
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.empty-state-sub {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    flex: 1;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: white;
}

.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background: hsl(4, 90%, 50%);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-icon:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.btn-text {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: color var(--transition-base);
    padding: var(--spacing-xs) var(--spacing-sm);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-text svg {
    width: 16px;
    height: 16px;
}

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

/* ===================================
   Form Inputs
   =================================== */
.input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.875rem;
    font-family: var(--font-main);
    transition: all var(--transition-base);
}

.input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

select.input {
    cursor: pointer;
}

/* ===================================
   Utilities
   =================================== */
.hidden {
    display: none !important;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9375rem;
    color: var(--color-text);
}

.footer-icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.footer-credit {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.footer-credit strong {
    color: var(--color-primary);
    font-weight: 600;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.social-link svg {
    width: 14px;
    height: 14px;
}

.social-link:hover {
    color: var(--color-primary);
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablets and below */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    .timer-card,
    .charts-card {
        grid-column: 1;
    }

    .insights-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile devices */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .header {
        padding: 0.75rem 0;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .logo-icon {
        width: 28px;
        height: 28px;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
    }

    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .stat-card {
        padding: 1rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .ai-insights-section,
    .daily-goals-section,
    .timer-card,
    .charts-card,
    .exams-card,
    .history-card {
        padding: 1rem;
        margin-bottom: 1.5rem;
    }

    .insights-grid {
        grid-template-columns: 1fr;
    }

    .card-title {
        font-size: 1.125rem;
    }

    .timer-ring-container {
        width: 180px;
        height: 180px;
    }

    .timer-display {
        font-size: 2.5rem;
    }

    .mode-toggle,
    .timer-controls {
        flex-direction: column;
        gap: 0.5rem;
    }

    .mode-btn,
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    /* Footer responsive */
    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .footer-left,
    .footer-center,
    .footer-right {
        justify-content: center;
    }

    .footer-left {
        font-size: 0.75rem;
    }

    .footer-center {
        font-size: 0.75rem;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .dashboard-stats {
        grid-template-columns: 1fr;
    }

    .timer-ring-container {
        width: 160px;
        height: 160px;
    }

    .timer-display {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .dashboard-stats {
        grid-template-columns: 1fr;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .timer-display {
        width: 180px;
        height: 180px;
    }

    .timer-time {
        font-size: 2rem;
    }

    .chart-container {
        height: 250px;
    }

    .footer .container {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .header {
        padding: var(--spacing-md) 0;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .main-content {
        padding: var(--spacing-lg) 0;
    }

    .card {
        padding: var(--spacing-md);
    }

    .card-title {
        font-size: 1.125rem;
    }
}

/* ===================================
   SVG Gradients
   =================================== */
svg defs {
    position: absolute;
}