/* ==========================================================================
   RaceFeed - Premium Motorsport PWA Design System
   Complete Redesign: Modern, Clean, Racing-Inspired
   ========================================================================== */

/* ==========================================================================
   1. CSS CUSTOM PROPERTIES & DESIGN TOKENS
   ========================================================================== */

:root {
    /* === COLORS === */
    --color-primary: #00d4aa;
    --color-primary-dark: #00b894;
    --color-primary-light: #55efc4;
    --color-primary-alpha: rgba(0, 212, 170, 0.1);
    --color-primary-alpha-strong: rgba(0, 212, 170, 0.2);

    --color-accent: #ff6b35;
    --color-accent-dark: #e55a2b;
    --color-accent-light: #ff8c66;
    --color-accent-alpha: rgba(255, 107, 53, 0.1);

    --color-racing-red: #ff3838;
    --color-racing-yellow: #fdcb6e;
    --color-racing-green: #00b894;
    --color-racing-blue: #0984e3;

    /* Surfaces - Dark Mode */
    --color-bg: #0b0e11;
    --color-bg-subtle: #0f1419;
    --color-surface: #151a1e;
    --color-surface-elevated: #1e2328;
    --color-surface-hover: #252b31;
    --color-surface-pressed: #2a3037;
    --color-surface-active: rgba(0, 212, 170, 0.15);

    /* Text - Dark Mode */
    --color-text-primary: #f7f8fc;
    --color-text-secondary: #c4c7d0;
    --color-text-tertiary: #6c7293;
    --color-text-inverse: #ffffff;
    --color-text-muted: #8b8fa3;

    /* Borders - Dark Mode */
    --color-border-light: #252b31;
    --color-border: #2a3037;
    --color-border-dark: #353c43;
    --color-border-focus: var(--color-primary);

    /* Status Colors */
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-error: #e74c3c;
    --color-info: var(--color-primary);

    /* === SHADOWS === */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.7);
    --shadow-focus: 0 0 0 3px rgba(0, 212, 170, 0.3);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.3);

    /* === SPACING SCALE === */
    --space-1: 0.25rem; /* 4px */
    --space-2: 0.5rem; /* 8px */
    --space-3: 0.75rem; /* 12px */
    --space-4: 1rem; /* 16px */
    --space-5: 1.25rem; /* 20px */
    --space-6: 1.5rem; /* 24px */
    --space-8: 2rem; /* 32px */
    --space-10: 2.5rem; /* 40px */
    --space-12: 3rem; /* 48px */
    --space-16: 4rem; /* 64px */
    --space-20: 5rem; /* 80px */

    /* === TYPOGRAPHY SCALE === */
    --text-xs: 0.75rem; /* 12px */
    --text-sm: 0.875rem; /* 14px */
    --text-base: 1rem; /* 16px */
    --text-lg: 1.125rem; /* 18px */
    --text-xl: 1.25rem; /* 20px */
    --text-2xl: 1.5rem; /* 24px */
    --text-3xl: 1.875rem; /* 30px */
    --text-4xl: 2.25rem; /* 36px */
    --text-5xl: 3rem; /* 48px */

    /* === RADIUS === */
    --radius-sm: 0.375rem; /* 6px */
    --radius-md: 0.5rem; /* 8px */
    --radius-lg: 0.75rem; /* 12px */
    --radius-xl: 1rem; /* 16px */
    --radius-2xl: 1.25rem; /* 20px */
    --radius-full: 9999px;

    /* === LAYOUT === */
    --header-height: 4rem; /* 64px */
    --nav-height: 4.5rem; /* 72px */
    --container-max-width: 75rem; /* 1200px */

    /* === TIMING FUNCTIONS === */
    --timing-fast: 150ms;
    --timing-base: 250ms;
    --timing-slow: 350ms;
    --ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);
    --ease-in-out-quart: cubic-bezier(0.77, 0, 0.175, 1);
    --ease-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==========================================================================
   2. BASE & RESET
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
    width: 100%;
    max-width: 100%;
}

/* Subtle background texture/gradient */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(0, 212, 170, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 107, 53, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Selection */
::selection {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   3. LAYOUT & APP SHELL
   ========================================================================== */

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

/* === HEADER === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: calc(var(--header-height) + env(safe-area-inset-top));
    background: rgba(21, 26, 30, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: env(safe-area-inset-top) var(--space-4) 0;
    box-shadow: var(--shadow-sm);
}

.header-logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: opacity var(--timing-base) var(--ease-out-quart);
    gap: var(--space-3);
}

.header-logo:hover {
    opacity: 0.8;
}

.header-logo:active {
    opacity: 0.6;
}

.header-icon {
    height: 3rem;
    width: auto;
    display: block;
    flex-shrink: 0;
    object-fit: contain;
    margin: 0;
    transform: translateY(2px);
}

.header h1 {
    font-size: clamp(var(--text-2xl), 3vw, var(--text-3xl));
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.03em;
    margin: 0;
    line-height: 1.1;
    flex-shrink: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

.header h1::before {
    content: "";
    display: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Theme toggle removed - permanent dark mode */

/* Navigation removed - not needed */

/* === MAIN CONTENT === */
.main {
    flex: 1;
    margin-top: calc(var(--header-height) + env(safe-area-inset-top));
    padding: var(--space-6) var(--space-4);
    padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom));
    position: relative;
    z-index: 1;
    min-height: calc(100vh - var(--header-height) - env(safe-area-inset-top) - 120px);
}

@media (min-width: 768px) {
    .main {
        max-width: var(--container-max-width);
        margin-left: auto;
        margin-right: auto;
        padding: var(--space-10) var(--space-6);
        width: 100%;
    }
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* === FOOTER === */
.footer {
    margin-top: auto;
    padding: var(--space-8) var(--space-4);
    padding-bottom: calc(var(--space-8) + env(safe-area-inset-bottom));
    background: var(--color-surface);
    border-top: 1px solid var(--color-border-light);
}

.footer-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-disclaimer {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.footer-copyright {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin: 0;
}

@media (min-width: 768px) {
    .footer {
        padding: var(--space-10) var(--space-6);
    }
}

/* ==========================================================================
   4. TYPOGRAPHY
   ========================================================================== */

h1,
.h1 {
    font-size: clamp(var(--text-2xl), 5vw, var(--text-4xl));
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h2,
.h2 {
    font-size: clamp(var(--text-xl), 4vw, var(--text-3xl));
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
    color: var(--color-text-primary);
}

h3,
.h3 {
    font-size: clamp(var(--text-lg), 3vw, var(--text-2xl));
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-primary);
}

.text-muted {
    color: var(--color-text-secondary);
}

.text-small {
    font-size: var(--text-sm);
}

.text-xs {
    font-size: var(--text-xs);
}

/* ==========================================================================
   5. CARDS & COMPONENTS
   ========================================================================== */

/* === BASE CARD === */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-6);
    transition: all var(--timing-base) var(--ease-out-quart);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--timing-base) var(--ease-out-quart);
}

.card:hover::before {
    opacity: 1;
}

.card-clickable {
    cursor: pointer;
}

.card-clickable:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
    gap: var(--space-4);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.3;
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
}

.card-content {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
}

.card-content p {
    margin-bottom: var(--space-2);
}

.card-content p:last-child {
    margin-bottom: 0;
}

.card-content strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* === LIST ITEMS === */
.list-item {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
    position: relative;
    transition: all var(--timing-base) var(--ease-out-quart);
    cursor: pointer;
    box-shadow: var(--shadow-xs);
}

.list-item:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.list-item-content {
    position: relative;
    z-index: 1;
}

/* === EVENT META HEADER === */
.event-meta-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface-hover);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Mobile: Improve readability for event meta header */
@media (max-width: 767px) {
    .event-meta-header {
        padding: var(--space-4) var(--space-5);
        font-size: var(--text-sm);
    }
}

.event-meta-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.series-name {
    color: var(--color-primary);
    font-size: var(--text-xl);
    font-weight: 800;
    letter-spacing: 0.02em;
}

/* Mobile: Make series name even larger for better readability */
@media (max-width: 767px) {
    .series-name {
        font-size: 2rem;
    }
}

.series-full-name {
    color: var(--color-text-primary);
    font-size: var(--text-base);
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0.02em;
    padding-top: var(--space-1);
}

/* Mobile: Improve readability for series full name */
@media (max-width: 767px) {
    .series-full-name {
        color: var(--color-text-primary);
        font-size: 0.8rem;
    }
}

.event-dates {
    color: var(--color-text-primary);
    font-size: var(--text-base);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* Remove letter spacing for event dates inside event-meta-header */
.event-meta-header .event-dates {
    letter-spacing: 0;
}

/* Mobile: Improve readability for event dates */
@media (max-width: 767px) {
    .event-dates {
        color: var(--color-text-primary);
        font-size: var(--text-base);
        font-weight: 600;
    }
}

/* === EVENT TITLE === */
.list-item-title {
    font-size: clamp(var(--text-lg), 2vw, var(--text-xl));
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.list-item-subtitle {
    color: var(--color-text-primary);
    font-size: var(--text-base);
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

/* Mobile: Improve readability for list item subtitle */
@media (max-width: 767px) {
    .list-item-subtitle {
        font-size: var(--text-base);
        color: var(--color-text-primary);
        line-height: 1.6;
    }
}

.circuit-info {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-wrap: wrap;
    line-height: 1.6;
}

/* Mobile: Improve readability for circuit info */
@media (max-width: 767px) {
    .circuit-info {
        color: var(--color-text-secondary);
        font-size: var(--text-sm);
        line-height: 1.6;
    }
}

/* === EVENT SESSIONS === */
.event-sessions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: var(--color-surface-hover);
    transition: all var(--timing-fast) var(--ease-out-quart);
}

.session-type {
    font-weight: 700;
    font-size: var(--text-base);
    color: var(--color-text-primary);
}

/* Mobile: Improve readability for session type */
@media (max-width: 767px) {
    .session-type {
        font-size: var(--text-base);
        font-weight: 700;
    }
}

/* Session Date and Time styling */
.session-time {
    text-align: right;
    line-height: 1.3;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--space-1);
    font-variant-numeric: tabular-nums;
}

.session-date {
    font-size: var(--text-base);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* Mobile: Improve readability for session date */
@media (max-width: 767px) {
    .session-date {
        font-size: var(--text-base);
        color: var(--color-text-primary);
        font-weight: 700;
    }
}

.session-hour {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}

/* Mobile: Improve readability for session hour */
@media (max-width: 767px) {
    .session-hour {
        color: var(--color-text-secondary);
        font-size: var(--text-base);
        font-weight: 600;
    }
}

/* Session Type Badges */
.session-badge {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.05em;
    min-height: 36px;
    max-width: fit-content;
    background: rgba(253, 203, 110, 0.15);
    color: var(--color-racing-yellow);
    border: 1px solid rgba(253, 203, 110, 0.3);
    box-shadow: var(--shadow-xs);
    line-height: 1.5;
    vertical-align: middle;
}

/* Mobile: Prevent text wrapping in session badge */
@media (max-width: 767px) {
    .session-badge {
        font-size: 0.9rem;
        padding: var(--space-2) var(--space-3);
        min-height: 32px;
        white-space: nowrap;
    }

    .session-badge .session-type {
        font-size: 0.9rem;
        white-space: nowrap;
    }
}

/* Center session badge content */
.session-badge .session-type {
    display: inline-flex;
    align-items: center;
    line-height: 1.5;
    vertical-align: middle;
}

/* Ensure the session-item itself centers the badge properly */
.session-item {
    align-items: center;
}

.session-badge--qualifying {
    background: rgba(0, 184, 148, 0.15);
    color: var(--color-racing-green);
    border-color: rgba(0, 184, 148, 0.3);
}

.session-badge--race {
    background: rgba(255, 56, 56, 0.15);
    color: var(--color-racing-red);
    border-color: rgba(255, 56, 56, 0.3);
}

/* ==========================================================================
   6. FILTERS & FORM ELEMENTS
   ========================================================================== */

/* === FILTERS CONTAINER === */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
    padding: var(--space-6);
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    position: sticky;
    top: calc(var(--header-height) + var(--space-4));
    z-index: 10;
    box-shadow: var(--shadow-sm);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* Mobile: Remove gray container styling, keep filters visible */
@media (max-width: 767px) {
    .filters {
        background: transparent;
        border: none;
        border-radius: 0;
        box-shadow: none;
        padding: 0;
        margin-bottom: var(--space-4);
        position: static;
    }
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    flex: 1;
    min-width: 0;
    max-width: 100%;
}

.filter-label {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-1);
}

/* === FORM ELEMENTS === */
select,
input[type="text"],
input[type="date"],
input[type="search"] {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    background: var(--color-surface);
    color: var(--color-text-primary);
    transition: all var(--timing-base) var(--ease-out-quart);
    width: 100%;
    min-height: 44px;
    font-family: inherit;
}

.filter-group select {
    width: 100%;
    min-width: 100px;
    max-width: 200px;
    align-self: flex-start;
    box-sizing: border-box;
}

select:focus,
input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
    background: var(--color-surface-elevated);
}

select:hover,
input:hover {
    border-color: var(--color-border-dark);
}

/* Custom select styling */
select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: var(--space-10);
    cursor: pointer;
}

select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%9ca3af' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
}

/* === CHIPS === */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-surface-elevated);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    transition: all var(--timing-fast) var(--ease-out-quart);
    min-height: 32px;
    box-shadow: var(--shadow-xs);
}

.chip:hover {
    border-color: var(--color-border-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.chip-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.chip-accent {
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-color: var(--color-accent);
}

.series-chip {
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

/* Quick Filter Chips */
.quick-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.quick-filter {
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--timing-base) var(--ease-out-quart);
    font-family: inherit;
}

.quick-filter:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-surface-hover);
    transform: translateY(-1px);
}

.quick-filter.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* ==========================================================================
   7. BUTTONS
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--timing-base) var(--ease-out-quart);
    min-height: 44px;
    font-family: inherit;
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-border-dark);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
    box-shadow: none;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-surface-hover);
    color: var(--color-text-primary);
}

/* ==========================================================================
   8. UTILITIES & STATES
   ========================================================================== */

/* === LOADING STATES === */
.skeleton {
    background: linear-gradient(90deg, var(--color-surface) 0%, var(--color-surface-hover) 50%, var(--color-surface) 100%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1em;
    margin: 0.5em 0;
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin: 0.5em 0;
}

.skeleton-card {
    height: 200px;
    margin-bottom: var(--space-4);
}

.skeleton-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* === SPINNER === */
.spinner {
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.spinner-small {
    width: 1rem;
    height: 1rem;
    border-width: 1.5px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* === EMPTY STATES === */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-4);
    color: var(--color-text-secondary);
}

.empty-state .icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-6);
    opacity: 0.6;
    display: block;
}

.empty-state h3 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.empty-state p {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.empty-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    flex-wrap: wrap;
}

/* === ERROR STATES === */
.error-state {
    text-align: center;
    padding: var(--space-16) var(--space-4);
    color: var(--color-text-secondary);
}

.error-state .icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-6);
    opacity: 0.8;
    display: block;
}

.error-state h3 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-error);
    margin-bottom: var(--space-3);
}

.error-state p {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.error-details {
    margin-top: var(--space-6);
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.error-details summary {
    cursor: pointer;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space-2);
}

.error-details pre {
    background: var(--color-surface-elevated);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.error-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    flex-wrap: wrap;
}

/* === LOADING OVERLAY === */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 14, 17, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
    color: var(--color-text-secondary);
}

.loading-content p {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
}

/* ==========================================================================
   9. MONTH HEADERS & CALENDAR SPECIFIC
   ========================================================================== */

.month-section {
    margin-top: var(--space-4);
    margin-bottom: 0;
}

.month-section:first-of-type {
    margin-top: var(--space-6);
}

.month-header {
    position: sticky;
    top: calc(var(--header-height) + var(--space-6));
    z-index: 20;
    background: var(--color-bg);
    padding: var(--space-8) 0 var(--space-6);
    margin-bottom: var(--space-8);
}

.month-title {
    font-size: clamp(var(--text-xl), 2.5vw, var(--text-3xl));
    font-weight: 800;
    color: var(--color-text-primary);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    padding: 0 var(--space-4);
    margin-bottom: var(--space-8);
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: nowrap;
}

/* Racing-inspired design elements */
.month-title::before,
.month-title::after {
    content: "";
    display: inline-block;
    width: 2rem;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-primary));
    flex-shrink: 0;
}

.month-title::after {
    background: linear-gradient(90deg, var(--color-primary), transparent);
}

@media (min-width: 480px) {
    .month-title::before,
    .month-title::after {
        width: 3rem;
    }
    .month-title {
        padding: 0 var(--space-6);
        gap: var(--space-4);
    }
}

@media (min-width: 768px) {
    .month-title::before,
    .month-title::after {
        width: 6rem;
    }
    .month-title {
        padding: 0 var(--space-8);
    }
}

.month-events {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* ==========================================================================
   11. GRID LAYOUTS
   ========================================================================== */

.grid {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: 1fr;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* ==========================================================================
   11. RESPONSIVE DESIGN
   ========================================================================== */

/* Mobile: Larger font size for filter selects */
@media (max-width: 767px) {
    .filter-group select {
        font-size: var(--text-lg);
        font-weight: 600;
        padding: var(--space-4) var(--space-5);
    }
}

@media (min-width: 480px) {
    .filters {
        flex-wrap: nowrap;
    }
}

@media (min-width: 768px) {
    .filters {
        padding: var(--space-8);
        top: calc(var(--header-height) + var(--space-6));
        margin-bottom: var(--space-12);
        justify-content: flex-start;
    }

    .filter-group {
        flex: 0 1 auto;
        max-width: 250px;
    }

    .filter-group select {
        max-width: 100%;
    }

    .month-header {
        top: calc(var(--header-height) + var(--space-8));
        padding: var(--space-12) 0 var(--space-8);
        margin-bottom: var(--space-8);
    }

    .list-item {
        padding: var(--space-8);
    }

    .card {
        padding: var(--space-8);
    }
}

@media (min-width: 1024px) {
    .list-item {
        padding: var(--space-10);
    }

    .filters {
        padding: var(--space-10);
        gap: var(--space-6);
    }

    /* Desktop: Better session item styling */
    .session-item {
        padding: var(--space-5) var(--space-6);
        border-radius: var(--radius-xl);
        background: var(--color-surface-elevated);
        border: 1px solid var(--color-border-light);
        box-shadow: var(--shadow-xs);
    }

    .session-badge {
        padding: var(--space-3) var(--space-5);
        min-height: 36px;
        font-size: var(--text-base);
    }

    .session-time {
        min-width: 140px;
    }

    .session-date {
        font-size: var(--text-base);
        font-weight: 700;
    }

    .session-hour {
        font-size: var(--text-base);
        font-weight: 600;
    }
}

/* ==========================================================================
   13. PRINT STYLES
   ========================================================================== */

@media print {
    .header,
    .navigation,
    .filters,
    .install-prompt {
        display: none !important;
    }

    .main {
        margin: 0 !important;
        padding: 0 !important;
    }

    .card,
    .list-item {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* ==========================================================================
   14. VIEW-SPECIFIC STYLES
   ========================================================================== */

/* === VIEW CONTAINERS === */
.calendar-view {
    width: 100%;
}

/* === INFO ITEMS === */
.info-item {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
    font-size: var(--text-sm);
}

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

.info-item strong {
    color: var(--color-text-primary);
    font-weight: 600;
    display: inline-block;
    min-width: 120px;
}

/* ==========================================================================
   15. ACCESSIBILITY IMPROVEMENTS
   ========================================================================== */

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-border: #ffffff;
        --color-text-secondary: #ffffff;
    }
}

/* Focus visible improvements */
*:focus-visible {
    outline-width: 2px;
    outline-style: solid;
    outline-color: var(--color-primary);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}