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

:root,
[data-theme="dark"] {
    --bg: #0f172a;
    --card: #1e293b;
    --card-border: #334155;
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.15);
    --green: #4ade80;
    --red: #f87171;
    --orange: #fb923c;
    --purple: #a78bfa;
    --radius: 12px;
    --input-placeholder: #475569;
}

[data-theme="light"] {
    --bg: #f1f5f9;
    --card: #ffffff;
    --card-border: #e2e8f0;
    --text: #1e293b;
    --text-dim: #64748b;
    --accent: #0284c7;
    --accent-glow: rgba(2, 132, 199, 0.12);
    --green: #16a34a;
    --red: #dc2626;
    --orange: #ea580c;
    --purple: #7c3aed;
    --input-placeholder: #94a3b8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
    padding-top: env(safe-area-inset-top, 16px);
    padding-bottom: calc(40px + env(safe-area-inset-bottom, 16px));
}

/* Header */
header {
    text-align: center;
    padding: 24px 0 16px;
}

.header-row {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.theme-toggle {
    position: absolute;
    right: 0;
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-dim);
    transition: all 0.2s;
}

.theme-toggle:active {
    transform: scale(0.9);
}

[data-theme="dark"] .icon-moon,
:root:not([data-theme="light"]) .icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun,
:root:not([data-theme="light"]) .icon-sun {
    display: block;
}

[data-theme="light"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon {
    display: block;
}

.subtitle {
    color: var(--text-dim);
    font-size: 14px;
    margin-top: 4px;
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

/* Shared Result Grid */
.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.result-item {
    background: var(--bg);
    border-radius: 8px;
    padding: 12px;
}

.result-item.full-width {
    grid-column: 1 / -1;
}

.result-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.result-value {
    display: block;
    font-size: 15px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    color: var(--accent);
    word-break: break-all;
}

/* Animation */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Chip (shared button/tag) */
.chip {
    padding: 6px 12px;
    font-size: 13px;
    background: var(--bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    color: var(--text-dim);
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
    -webkit-user-select: none;
}

.chip:active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

/* Floating Action Button (App Launcher) */
.launcher-fab {
    position: fixed;
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
    z-index: 200;
    transition: transform 0.2s, box-shadow 0.2s;
}

.launcher-fab:active {
    transform: scale(0.92);
}

.launcher-fab.active {
    transform: rotate(45deg);
    border-radius: 50%;
}

/* Drawer Overlay */
.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 300;
}

.drawer-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* Drawer */
.drawer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    padding: 12px 20px;
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    z-index: 400;
    max-height: 70vh;
    overflow-y: auto;
}

.drawer.open {
    transform: translateY(0);
}

.drawer-handle {
    width: 36px;
    height: 4px;
    background: var(--card-border);
    border-radius: 2px;
    margin: 0 auto 16px;
}

/* Drawer Grid */
.drawer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.drawer-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 8px;
    background: var(--bg);
    border: 2px solid transparent;
    border-radius: 14px;
    color: var(--text-dim);
    font-family: inherit;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.drawer-item:active {
    transform: scale(0.95);
}

.drawer-item.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drawer-item-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.drawer-item-icon svg {
    width: 26px;
    height: 26px;
}

.drawer-item-label {
    text-align: center;
    line-height: 1.2;
}

.drawer-item-external {
    opacity: 0.6;
    border-style: dashed;
    border-color: var(--card-border);
}

.drawer-item-external:active {
    opacity: 0.9;
}

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

/* Footer */
footer {
    text-align: center;
    padding: 16px 0 24px;
}

footer .footer-install {
    font-size: 12px;
    color: var(--text-dim);
}

footer .footer-copyright {
    font-size: 11px;
    color: var(--text-dim);
    margin-top: 8px;
    opacity: 0.7;
}

footer .footer-version {
    font-size: 10px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    color: var(--text-dim);
    margin-top: 4px;
    opacity: 0.5;
}

/* Update Banner */
.update-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px 16px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    background: var(--accent);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    z-index: 9999;
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.update-banner.visible {
    transform: translateY(0);
}

.update-banner button {
    padding: 6px 14px;
    border: 2px solid #fff;
    border-radius: 20px;
    background: transparent;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.update-banner button:active {
    background: #fff;
    color: var(--accent);
}

/* Light mode overrides */
[data-theme="light"] #cidr-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
}

/* Scrollbar */
::-webkit-scrollbar {
    height: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 2px;
}