/* ============================================
   Whoosh.share — iOS-inspired Design System
   ============================================ */

/* CSS Variables — Design Tokens */
:root {
    /* Colors — Light Mode */
    --background: #F2F2F7;
    --surface: #FFFFFF;
    --surface-2: #F2F2F7;
    --text-primary: #000000;
    --text-secondary: #6C6C70;
    --text-tertiary: #AEAEB2;
    --accent: #007AFF;
    --accent-light: #E8F1FF;
    --success: #34C759;
    --error: #FF3B30;
    --border: rgba(0, 0, 0, 0.08);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-device: 0 8px 32px rgba(0, 0, 0, 0.10), 0 2px 8px rgba(0, 0, 0, 0.06);
    
    /* Border Radius */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    /* Spacing — 8px base grid */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-lg: 17px;
    --font-size-xl: 20px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-base: 250ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 350ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ============================================
   Base Styles
   ============================================ */

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

html, body {
    width: 100%;
    min-height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.5;
}

/* ============================================
   App Layout
   ============================================ */

.app {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.app-header {
    padding: var(--space-4) var(--space-5);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app-title {
    font-size: 34px;
    line-height: 1;
    font-weight: 750;
    letter-spacing: 0;
    color: var(--text-primary);
}

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

.icon-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.icon-btn:active {
    transform: scale(0.96);
}

.icon-btn:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-4);
    padding: var(--space-2) var(--space-5) var(--space-6);
    overflow: visible;
}

/* ============================================
   Radar Component
   ============================================ */

.radar-container {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 220px;
}

.radar {
    position: relative;
    width: 240px;
    height: 240px;
    border-radius: 50%;
}

/* Static background rings */
.radar-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--border);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.radar-ring-1 {
    width: 80px;
    height: 80px;
}

.radar-ring-2 {
    width: 150px;
    height: 150px;
}

.radar-ring-3 {
    width: 220px;
    height: 220px;
}

/* Pulse rings — animated when listening */
.radar-pulse-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.radar-pulse {
    position: absolute;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    border: 1.5px solid var(--accent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.3);
    opacity: 0;
    animation: radar-pulse 2s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

.radar-pulse:nth-child(2) {
    animation-delay: 0.66s;
}

.radar-pulse:nth-child(3) {
    animation-delay: 1.33s;
}

@keyframes radar-pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.3);
        opacity: 0.5;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0;
    }
}

/* Center icon */
.radar-center {
    position: absolute;
    width: 48px;
    height: 48px;
    background: var(--surface);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: all var(--transition-base);
}

.radar-icon {
    color: var(--text-secondary);
    transition: color var(--transition-base);
}

.radar-center.active .radar-icon {
    color: var(--accent);
}

/* Device bubbles */
.device-bubbles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.device-bubble {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 72px;
    height: 72px;
    background: var(--surface);
    border-radius: 50%;
    box-shadow: var(--shadow-device);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    pointer-events: all;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    animation: device-bubble-enter var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes device-bubble-enter {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 0;
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

.device-bubble:hover,
.device-bubble:active {
    transform: translate(-50%, -50%) scale(1.06);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.08);
}

.device-bubble-icon {
    font-size: 28px;
    margin-bottom: var(--space-1);
}

.device-bubble-name {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    text-align: center;
}

/* ============================================
   Status & Actions
   ============================================ */

.status-container {
    text-align: center;
    margin: 0;
    max-width: 360px;
}

.app-summary {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--space-3);
    line-height: 1.45;
}

.setup-note {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    background: var(--accent-light);
    border: 1px solid rgba(0, 122, 255, 0.14);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    margin-bottom: var(--space-3);
    line-height: 1.4;
}

.status-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.status-hint {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.hint-item {
    display: block;
}

.action-container {
    width: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    flex-shrink: 0;
}

.device-info {
    margin-top: 0;
    text-align: center;
}

.device-info-text {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: #0066E0;
}

.btn-primary:disabled {
    background: var(--text-tertiary);
    cursor: not-allowed;
    opacity: 0.5;
}

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

.btn-secondary:hover {
    background: var(--surface-2);
}

/* ============================================
   Bottom Sheet
   ============================================ */

.bottom-sheet-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 100;
    animation: backdrop-fade-in var(--transition-slow);
}

@keyframes backdrop-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    max-height: 70vh;
    background: var(--surface);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12);
    z-index: 101;
    padding: var(--space-4) var(--space-5) calc(var(--space-6) + env(safe-area-inset-bottom));
    animation: bottom-sheet-slide-up var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes bottom-sheet-slide-up {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.bottom-sheet-handle {
    width: 32px;
    height: 4px;
    background: var(--text-tertiary);
    border-radius: 99px;
    margin: 0 auto var(--space-5);
    opacity: 0.3;
}

.bottom-sheet-content {
    overflow-y: auto;
    max-height: calc(70vh - 80px);
}

/* ============================================
   Recent Devices Panel
   ============================================ */

.side-panel-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.22);
    z-index: 110;
    animation: backdrop-fade-in var(--transition-slow);
}

.side-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: min(360px, 92vw);
    height: 100%;
    background: var(--surface);
    z-index: 111;
    padding: calc(var(--space-5) + env(safe-area-inset-top)) var(--space-5) calc(var(--space-5) + env(safe-area-inset-bottom));
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.12);
    overflow-y: auto;
    animation: side-panel-in var(--transition-base);
}

@keyframes side-panel-in {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

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

.side-panel-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 650;
    letter-spacing: 0;
}

.side-panel-header p,
.side-panel-note {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.side-panel-note {
    background: var(--surface-2);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    margin-bottom: var(--space-4);
}

.cached-devices {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.cached-device {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    text-align: left;
}

.cached-device-main {
    min-width: 0;
}

.cached-device-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cached-device-meta {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.cached-device-status {
    flex-shrink: 0;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.empty-devices {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    padding: var(--space-4);
    text-align: center;
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
}

/* ============================================
   Error Toast
   ============================================ */

.error-toast {
    position: fixed;
    top: calc(var(--space-5) + env(safe-area-inset-top));
    left: 50%;
    transform: translateX(-50%);
    background: var(--error);
    color: white;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 200;
    animation: toast-slide-down var(--transition-base);
}

@keyframes toast-slide-down {
    from {
        transform: translateX(-50%) translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

.error-toast-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* ============================================
   Responsive — Short Mobile
   ============================================ */

@media (max-height: 720px) and (max-width: 639px) {
    .app-header {
        padding: var(--space-3) var(--space-4);
    }

    .app-title {
        font-size: 30px;
    }

    .app-main {
        gap: var(--space-3);
        padding: 0 var(--space-4) var(--space-5);
    }

    .radar-container {
        min-height: 190px;
    }

    .radar {
        width: 200px;
        height: 200px;
    }

    .radar-ring-1 { width: 68px; height: 68px; }
    .radar-ring-2 { width: 125px; height: 125px; }
    .radar-ring-3 { width: 185px; height: 185px; }

    .radar-pulse {
        width: 185px;
        height: 185px;
    }

    .app-summary,
    .setup-note,
    .status-text {
        font-size: var(--font-size-sm);
    }

    .setup-note {
        padding: var(--space-2) var(--space-3);
    }

    .btn {
        padding: var(--space-3) var(--space-5);
    }
}

/* ============================================
   Responsive — Desktop
   ============================================ */

@media (min-width: 640px) {
    .app {
        justify-content: center;
        align-items: center;
    }
    
    .app-main {
        max-width: 480px;
        min-height: 680px;
        background: var(--surface);
        border-radius: var(--radius-xl);
        box-shadow: var(--shadow-md);
        padding: var(--space-8);
        justify-content: flex-start;
        gap: var(--space-5);
    }
    
    .radar {
        width: 280px;
        height: 280px;
    }
    
    .radar-ring-1 { width: 90px; height: 90px; }
    .radar-ring-2 { width: 170px; height: 170px; }
    .radar-ring-3 { width: 240px; height: 240px; }
    
    .radar-pulse {
        width: 240px;
        height: 240px;
    }
    
    .bottom-sheet {
        left: 50%;
        transform: translateX(-50%);
        max-width: 480px;
        border-radius: var(--radius-xl);
        bottom: var(--space-6);
    }
    
    @keyframes bottom-sheet-slide-up {
        from {
            transform: translateX(-50%) translateY(100%);
        }
        to {
            transform: translateX(-50%) translateY(0);
        }
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

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

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }