/* CSS Variables for Theme Management */
:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --background-color: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --timer-bg: #f8f9fa;
    --timer-text: #212529;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --background-color: #121212;
    --text-color: #ffffff;
    --border-color: #333333;
    --shadow-color: rgba(255, 255, 255, 0.1);
    --timer-bg: #1e1e1e;
    --timer-text: #ffffff;
    --light-color: #333333;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: all 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Minimal Brutalism Design Elements */
.brutalist-border {
    border: 3px solid var(--dark-color);
    box-shadow: 5px 5px 0 var(--dark-color);
}

.brutalist-button {
    border: 2px solid var(--dark-color);
    background: var(--background-color);
    color: var(--text-color);
    font-weight: bold;
    text-transform: uppercase;
    transition: all 0.2s ease;
}

.brutalist-button:hover {
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--dark-color);
}

/* Header Styles */
.header {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 0;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.navbar-brand {
    color: white !important;
    font-size: 1.5rem;
}

.header .btn {
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.header .btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Timer Display */
.timer-display {
    background: var(--timer-bg);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 10px 30px var(--shadow-color);
    border: 3px solid var(--border-color);
    margin-bottom: 2rem;
}

.timer-mode-indicator {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.timer-main {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: bold;
    color: var(--timer-text);
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.1em;
}

.timer-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.timer-controls .btn {
    min-width: 120px;
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.timer-controls .btn i {
    margin-right: 0.5rem;
}

/* Quick Controls */
.quick-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.quick-controls .btn {
    padding: 0.75rem 1.5rem;
    font-weight: bold;
    border-radius: 10px;
    transition: all 0.3s ease;
}

/* Game Modes */
.game-modes {
    background: var(--light-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px var(--shadow-color);
}

.btn-mode {
    width: 100%;
    height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    transition: all 0.3s ease;
    font-weight: bold;
}

.btn-mode i {
    font-size: 1.5rem;
}

.btn-mode:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.btn-mode.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Ad Banners */
.ad-banner {
    background: var(--light-color);
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
    margin: 1rem 0;
}

.ad-placeholder {
    color: var(--text-color);
    opacity: 0.6;
    font-size: 0.9rem;
}

.ad-placeholder i {
    margin-right: 0.5rem;
}

.mobile-ad {
    display: none;
}

/* FAQ Section */
.faq-section {
    background: var(--light-color);
    padding: 3rem 0;
    margin-top: 2rem;
}

.accordion-item {
    border: 2px solid var(--border-color);
    margin-bottom: 1rem;
    border-radius: 10px;
    overflow: hidden;
}

.accordion-button {
    background: var(--background-color);
    color: var(--text-color);
    font-weight: bold;
    border: none;
}

.accordion-button:not(.collapsed) {
    background: var(--primary-color);
    color: white;
}

.accordion-body {
    background: var(--background-color);
    color: var(--text-color);
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    margin-top: auto;
}

/* Modal Styles */
.modal-content {
    background: var(--background-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 15px;
}

.modal-header {
    border-bottom: 2px solid var(--border-color);
    background: var(--light-color);
}

.modal-footer {
    border-top: 2px solid var(--border-color);
    background: var(--light-color);
}

/* Offcanvas Styles */
.offcanvas {
    background: var(--background-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.offcanvas-header {
    border-bottom: 2px solid var(--border-color);
    background: var(--light-color);
}

/* Form Controls */
.form-range {
    accent-color: var(--primary-color);
}

.form-select,
.form-control {
    background: var(--background-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(33, 150, 243, 0.25);
}

/* History List */
.history-item {
    background: var(--light-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 0.5rem;
}

.history-item-header {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.history-item-details {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Preset Buttons */
.preset-button {
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    width: 100%;
    text-align: left;
    transition: all 0.3s ease;
}

.preset-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.preset-button i {
    margin-right: 0.5rem;
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.timer-pulse {
    animation: pulse 1s infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.timer-warning {
    animation: shake 0.5s infinite;
    color: var(--danger-color) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .timer-main {
        font-size: clamp(2rem, 10vw, 4rem);
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .timer-controls .btn {
        width: 100%;
        max-width: 200px;
    }
    
    .quick-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .quick-controls .btn {
        width: 100%;
        max-width: 200px;
    }
    
    .mobile-ad {
        display: block;
    }
    
    .game-modes {
        padding: 1rem;
    }
    
    .btn-mode {
        height: 80px;
        font-size: 0.9rem;
    }
    
    .btn-mode i {
        font-size: 1.2rem;
    }
}

@media (max-width: 576px) {
    .timer-display {
        padding: 1rem;
    }
    
    .timer-main {
        font-size: clamp(1.5rem, 12vw, 3rem);
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .main-content {
        padding: 1rem 0;
    }
    
    .faq-section {
        padding: 2rem 0;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .ad-banner,
    .btn,
    .offcanvas,
    .modal {
        display: none !important;
    }
    
    .timer-display {
        border: 2px solid #000;
        box-shadow: none;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --shadow-color: rgba(0, 0, 0, 0.5);
        --border-color: #000000;
    }
    
    .btn-mode {
        border-width: 3px;
    }
    
    .timer-display {
        border-width: 4px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Accessibility */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: "";
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

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

/* Success/Error States */
.success-state {
    background-color: var(--success-color) !important;
    color: white !important;
}

.error-state {
    background-color: var(--danger-color) !important;
    color: white !important;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

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