/* ============================================================
   buntools.css — Universal Shared Stylesheet
   Buntools | https://buntools.pages.dev
   ============================================================ */

/* CSS RESET & BASE */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ============================================================
   DESIGN TOKENS — Light Mode
   ============================================================ */
:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #121212;
    --text-muted: #64748b;
    --primary: #10f4a6;
    --primary-hover: #0ed18f;
    --primary-text: #052317;
    --primary-accent: #059669;
    --border: #e2e8f0;
    --radius-md: 8px;
    --radius-lg: 12px;
    --success: #15803d;
    --warning: #b45309;
    --danger: #dc2626;
    --info: #0284c7;
    --input-bg: #ffffff;
    --stat-bg: #f8fafc;
    --focus-ring: rgba(16, 244, 166, 0.35);
}

/* ============================================================
   DESIGN TOKENS — Dark Mode
   ============================================================ */
[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1a1b1f;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #10f4a6;
    --primary-hover: #34f5b2;
    --primary-text: #051d14;
    --primary-accent: #10f4a6;
    --border: #282a32;
    --success: #7dff95;
    --warning: #ffbc5e;
    --danger: #ff8080;
    --info: #87d1ff;
    --input-bg: #141518;
    --stat-bg: #141518;
    --focus-ring: rgba(16, 244, 166, 0.4);
}

/* ============================================================
   BODY
   ============================================================ */
body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.2s, color 0.2s;
}

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.logo:hover .logo-icon {
    transform: rotate(10deg) scale(1.06);
}

.header-right {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.back-btn {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.back-btn:hover { color: var(--primary); }

.theme-btn, .lang-btn {
    background: var(--bg-color);
    border: 1px solid var(--border);
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.85rem;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.theme-btn:hover, .lang-btn:hover {
    background: var(--border);
    border-color: var(--primary);
}

/* ============================================================
   MAIN LAYOUT
   ============================================================ */
main {
    max-width: 800px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.tool-header { margin-bottom: 1.5rem; }
h1 { font-size: 1.8rem; margin-bottom: 0.3rem; }
p.subtitle { color: var(--text-muted); font-size: 0.95rem; }

/* ============================================================
   FORM COMPONENTS
   ============================================================ */
.form-group { margin-bottom: 1.25rem; }

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    color: var(--text-main);
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--input-bg);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    background: var(--primary);
    color: var(--primary-text);
    font-weight: 700;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background 0.2s, transform 0.1s;
    font-size: 0.95rem;
    min-height: 44px;
    touch-action: manipulation;
}
.btn:hover { background: var(--primary-hover); }
.btn:active { transform: scale(0.98); }

.btn-secondary {
    background: var(--border);
    color: var(--text-main);
}
.btn-secondary:hover { background: #cbd5e1; }
[data-theme="dark"] .btn-secondary:hover { background: #475569; }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; }

.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

/* ============================================================
   UTILITY COMPONENTS
   ============================================================ */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    user-select: none;
    color: var(--text-main);
}
.checkbox-group input {
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}
.stat-box {
    background: var(--stat-bg);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: center;
}
.stat-num {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-accent);
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================================
   TOAST NOTIFICATION
   ============================================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #121212;
    color: #ffffff;
    border: 1px solid #282a32;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.25);
}
[data-theme="dark"] .toast {
    background: #1a1b1f;
    color: #f8fafc;
    border-color: var(--primary);
    font-weight: bold;
}
.toast.show { opacity: 1; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 4rem;
    font-size: 0.9rem;
}

/* ============================================================
   MOBILE: iOS Safari auto-zoom fix + responsive layout
   ============================================================ */
input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="password"],
textarea,
select {
    font-size: 16px !important;
    -webkit-tap-highlight-color: transparent;
}

@media (max-width: 600px) {
    header { padding: 0.75rem 1rem; }

    .logo {
        font-size: 1.15rem;
        gap: 0.45rem;
    }

    .logo-icon {
        width: 24px;
        height: 24px;
    }

    .header-right { gap: 0.4rem; }

    .theme-btn, .lang-btn, .back-btn {
        padding: 0.35rem 0.55rem;
        font-size: 0.8rem;
    }

    main {
        margin: 1rem auto;
        padding: 0 0.75rem;
    }

    .tool-card {
        padding: 1.25rem 1rem;
        border-radius: 12px;
    }

    h1 { font-size: 1.4rem; }

    p.subtitle {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }

    .btn-group { gap: 0.5rem; }

    .btn-group .btn {
        flex: 1 1 calc(50% - 0.5rem);
        padding: 0.65rem 0.85rem;
        font-size: 0.85rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.65rem;
    }

    .stat-box { padding: 0.75rem 0.5rem; }
    .stat-num { font-size: 1.4rem; }
    .stat-label { font-size: 0.75rem; }

    .big-number,
    #stopwatchDisplay,
    #countdownDisplay,
    #ipDisplay,
    #bmiNum {
        font-size: clamp(2rem, 9vw, 3.2rem) !important;
    }
}