/* ========================================
   Box Breathing Timer - Styles
   ======================================== */

/* CSS Custom Properties */
:root {
    --bg-deep: #0a0a1a;
    --bg-mid: #12122a;
    --bg-surface: #1a1a3a;
    --accent-primary: #4ecdc4;
    --accent-secondary: #ff6b6b;
    --accent-tertiary: #ffe66d;
    --text-primary: #f0f0f5;
    --text-secondary: #8888aa;
    --text-muted: #5555777;
    
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 600ms ease;
    
    --shadow-glow: 0 0 40px rgba(78, 205, 196, 0.3);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-mono);
    background: linear-gradient(145deg, var(--bg-deep) 0%, var(--bg-mid) 50%, var(--bg-surface) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
}

/* App Container */
.app {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1.5rem;
    position: relative;
}

/* Ambient Background Orbs */
.ambient-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
    bottom: -50px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--accent-tertiary) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

/* Particle Canvas */
.particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.6;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
    z-index: 1;
}

.header h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    text-transform: lowercase;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
    width: 100%;
    max-width: 500px;
    z-index: 1;
}

/* Timer Display */
.timer-display {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.circle-container {
    position: relative;
    width: min(280px, 70vw);
    height: min(280px, 70vw);
}

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

.progress-ring__bg {
    fill: none;
    stroke: var(--bg-surface);
    stroke-width: 4;
}

.progress-ring__progress {
    fill: none;
    stroke: var(--accent-primary);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: 565.48;
    transition: stroke-dashoffset 0.1s linear, stroke var(--transition-normal);
    filter: drop-shadow(0 0 8px var(--accent-primary));
}

.timer-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.phase-label {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
    letter-spacing: 0.05em;
    transition: color var(--transition-normal);
}

.timer-value {
    font-family: var(--font-mono);
    font-size: clamp(3.5rem, 12vw, 5rem);
    font-weight: 500;
    color: var(--accent-primary);
    line-height: 1;
    transition: color var(--transition-normal);
}

.cycle-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.elapsed-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

/* Phase Colors */
.timer-display[data-phase="0"] .progress-ring__progress,
.timer-display[data-phase="0"] .timer-value { 
    stroke: var(--accent-primary); 
    color: var(--accent-primary);
}

.timer-display[data-phase="1"] .progress-ring__progress,
.timer-display[data-phase="1"] .timer-value { 
    stroke: var(--accent-tertiary); 
    color: var(--accent-tertiary);
}

.timer-display[data-phase="2"] .progress-ring__progress,
.timer-display[data-phase="2"] .timer-value { 
    stroke: var(--accent-secondary); 
    color: var(--accent-secondary);
}

.timer-display[data-phase="3"] .progress-ring__progress,
.timer-display[data-phase="3"] .timer-value { 
    stroke: #a78bfa; 
    color: #a78bfa;
}

/* Controls */
.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--bg-deep);
    box-shadow: 0 4px 20px rgba(78, 205, 196, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(78, 205, 196, 0.5);
}

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

.btn-secondary {
    background: transparent;
    color: var(--accent-secondary);
    border: 2px solid var(--accent-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--accent-secondary);
    color: var(--bg-deep);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border: 1px dashed var(--text-muted);
}

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

/* Settings Toggle Button */
.settings-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: rgba(26, 26, 58, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.settings-toggle:hover {
    background: rgba(26, 26, 58, 0.6);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

.settings-toggle[aria-expanded="true"] {
    background: rgba(78, 205, 196, 0.15);
    border-color: rgba(78, 205, 196, 0.3);
    color: var(--accent-primary);
}

.settings-toggle:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Hamburger Icon */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 18px;
    height: 14px;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: all var(--transition-normal);
    transform-origin: center;
}

/* Hamburger to X animation */
.settings-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.settings-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.settings-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Settings Panel */
.settings {
    width: 100%;
    background: rgba(26, 26, 58, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    
    /* Collapsible styles */
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    padding: 0 1.5rem;
    margin-top: 0;
    overflow: hidden;
    transition: grid-template-rows var(--transition-slow),
                opacity var(--transition-normal),
                padding var(--transition-slow),
                margin-top var(--transition-slow);
}

.settings[aria-hidden="false"] {
    grid-template-rows: 1fr;
    opacity: 1;
    padding: 1.5rem;
    margin-top: 0;
}

.settings-inner {
    min-height: 0;
    overflow: hidden;
}

.settings-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    text-align: center;
    letter-spacing: 0.1em;
}

/* Preset Selector */
.preset-selector {
    margin-bottom: 1.25rem;
}

.preset-selector .setting-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.preset-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.5rem 0.875rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex: 1;
    min-width: 70px;
}

.preset-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.preset-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-deep);
}

.preset-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Sound Toggle */
.sound-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.toggle-icon {
    font-size: 1rem;
    transition: opacity var(--transition-normal);
}

.toggle-icon.muted {
    opacity: 0.4;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-normal), border-color var(--transition-normal);
    padding: 0;
}

.toggle-switch[aria-pressed="true"] {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: var(--text-primary);
    border-radius: 50%;
    transition: transform var(--transition-normal);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.toggle-switch[aria-pressed="true"] .toggle-knob {
    transform: translateX(22px);
}

.toggle-switch:hover {
    border-color: rgba(255, 255, 255, 0.3);
}

.toggle-switch:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.timer-phases {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.phase-input-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.phase-input-group .phase-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    width: 1.5rem;
    flex-shrink: 0;
}

.phase-input-group input[type="text"] {
    flex: 1;
    min-width: 0;
}

.phase-input-group input[type="number"] {
    width: 4rem;
    text-align: center;
}

.phase-input-group .unit {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.phase-input-group .btn-remove {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.25rem;
    line-height: 1;
    transition: color var(--transition-fast);
}

.phase-input-group .btn-remove:hover {
    color: var(--accent-secondary);
}

.setting-group {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.setting-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-field {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    padding: 0.625rem 0.875rem;
    width: 100%;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.15);
}

.input-field::placeholder {
    color: var(--text-muted);
}

/* Remove number input spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* Footer */
.footer {
    margin-top: auto;
    padding-top: 2rem;
    text-align: center;
    z-index: 1;
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
}

/* Running State */
.app.running .settings-toggle,
.app.running .settings {
    opacity: 0.4;
    pointer-events: none;
}

/* Breathing Animation on Circle - synced to phases */
.circle-container {
    --phase-duration: 4s;
    transition: transform var(--phase-duration) ease-in-out;
}

.circle-container.inhale {
    transform: scale(1.1);
}

.circle-container.hold {
    /* Maintains current scale with quick settle */
    transition-duration: 0.3s;
}

.circle-container.exhale {
    transform: scale(0.92);
}

/* Responsive Adjustments */
@media (max-width: 480px) {
    .app {
        padding: 1.5rem 1rem;
    }
    
    .controls {
        width: 100%;
    }
    
    .btn {
        flex: 1;
        min-width: 0;
        padding: 1rem 1.5rem;
    }
    
    .settings {
        padding: 1.25rem;
    }
    
    .phase-input-group {
        flex-wrap: wrap;
    }
    
    .phase-input-group input[type="text"] {
        order: 1;
        width: 100%;
        flex: none;
        margin-top: 0.5rem;
    }
    
    .phase-input-group .phase-number {
        order: 0;
    }
    
    .phase-input-group input[type="number"] {
        order: 0;
        flex: 1;
    }
    
    .phase-input-group .unit {
        order: 0;
    }
    
    .phase-input-group .btn-remove {
        order: 0;
    }
}

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

/* Focus visible for keyboard users */
.btn:focus-visible,
.input-field:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}