:root {
    --font-main: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Fira Code', monospace;

    --bg-gradient: linear-gradient(135deg, #f0f4ff 0%, #e5edff 50%, #fdf2f8 100%);
    --card-bg: rgba(255, 255, 255, 0.88);
    --card-border: rgba(99, 102, 241, 0.18);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-glow: rgba(79, 70, 229, 0.30);
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --input-bg: rgba(255, 255, 255, 0.95);
    --stat-badge: rgba(79, 70, 229, 0.06);
    --secret-box-bg: #f8fafc;
    --secret-box-border: #cbd5e1;
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.3);
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning-bg: rgba(245, 158, 11, 0.12);
    --info-bg: rgba(6, 182, 212, 0.12);
    --shadow-sm: 0 4px 12px -3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 20px 40px -15px rgba(0, 0, 0, 0.12);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-gradient: radial-gradient(ellipse at top right, #1e1b4b 0%, #0f172a 40%, #020617 100%);
        --card-bg: rgba(15, 23, 42, 0.72);
        --card-border: rgba(255, 255, 255, 0.08);
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --primary: #6366f1;
        --primary-hover: #818cf8;
        --primary-glow: rgba(99, 102, 241, 0.40);
        --accent-cyan: #22d3ee;
        --accent-pink: #f472b6;
        --accent-emerald: #34d399;
        --accent-amber: #fbbf24;
        --input-bg: rgba(2, 6, 23, 0.55);
        --stat-badge: rgba(255, 255, 255, 0.04);
        --secret-box-bg: rgba(2, 6, 23, 0.75);
        --secret-box-border: rgba(99, 102, 241, 0.25);
        --danger: #f87171;
        --danger-glow: rgba(248, 113, 113, 0.35);
        --success-bg: rgba(52, 211, 153, 0.12);
        --warning-bg: rgba(251, 191, 36, 0.12);
        --info-bg: rgba(34, 211, 238, 0.12);
        --shadow-sm: 0 4px 12px -3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    }
}

[data-theme="dark"] {
    --bg-gradient: radial-gradient(ellipse at top right, #1e1b4b 0%, #0f172a 40%, #020617 100%);
    --card-bg: rgba(15, 23, 42, 0.72);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.40);
    --accent-cyan: #22d3ee;
    --accent-pink: #f472b6;
    --accent-emerald: #34d399;
    --accent-amber: #fbbf24;
    --input-bg: rgba(2, 6, 23, 0.55);
    --stat-badge: rgba(255, 255, 255, 0.04);
    --secret-box-bg: rgba(2, 6, 23, 0.75);
    --secret-box-border: rgba(99, 102, 241, 0.25);
    --danger: #f87171;
    --danger-glow: rgba(248, 113, 113, 0.35);
    --success-bg: rgba(52, 211, 153, 0.12);
    --warning-bg: rgba(251, 191, 36, 0.12);
    --info-bg: rgba(34, 211, 238, 0.12);
    --shadow-sm: 0 4px 12px -3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-gradient: linear-gradient(135deg, #f0f4ff 0%, #e5edff 50%, #fdf2f8 100%);
    --card-bg: rgba(255, 255, 255, 0.88);
    --card-border: rgba(99, 102, 241, 0.18);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-glow: rgba(79, 70, 229, 0.30);
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --input-bg: rgba(255, 255, 255, 0.95);
    --stat-badge: rgba(79, 70, 229, 0.06);
    --secret-box-bg: #f8fafc;
    --secret-box-border: #cbd5e1;
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.3);
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning-bg: rgba(245, 158, 11, 0.12);
    --info-bg: rgba(6, 182, 212, 0.12);
    --shadow-sm: 0 4px 12px -3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 20px 40px -15px rgba(0, 0, 0, 0.12);
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    line-height: 1.5;
}

.container {
    width: 100%;
    max-width: 960px;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

/* ── Header ──────────────────────────────────────────────────── */
.header-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-group h1 {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent-pink), var(--accent-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-group p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.15rem;
}

.theme-toggle-btn {
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    font-size: 0.85rem;
    cursor: pointer;
    font-weight: 600;
    font-family: var(--font-main);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.theme-toggle-btn:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.stat-box {
    background: var(--stat-badge);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--primary);
}

.stat-value.accent { color: var(--accent-pink); }
.stat-value.emerald { color: var(--accent-emerald); }
.stat-value.amber { color: var(--accent-amber); }

/* ── Cards ───────────────────────────────────────────────────── */
.crypto-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.section-title {
    font-size: 1.15rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge-bar {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.55rem;
    border-radius: 6px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.badge.green {
    background: var(--success-bg);
    color: var(--accent-emerald);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.badge.blue {
    background: var(--info-bg);
    color: var(--accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.25);
}

.badge.pink {
    background: rgba(236, 72, 153, 0.12);
    color: var(--accent-pink);
    border: 1px solid rgba(236, 72, 153, 0.25);
}

.badge.amber {
    background: var(--warning-bg);
    color: var(--accent-amber);
    border: 1px solid rgba(245, 158, 11, 0.25);
}

/* ── Controls ────────────────────────────────────────────────── */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 1.1rem;
    background: var(--stat-badge);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
}

select, input[type="text"], textarea {
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.88rem;
    outline: none;
    width: 100%;
    transition: border-color 0.2s, box-shadow 0.2s;
}

select:focus, input[type="text"]:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea { resize: vertical; }

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    margin-top: 1.2rem;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* ── Secret Display ──────────────────────────────────────────── */
.output-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.secret-display {
    background: var(--secret-box-bg);
    border: 2px dashed var(--secret-box-border);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.7;
    word-break: break-all;
    min-height: 100px;
    color: var(--text-main);
    position: relative;
    user-select: all;
    transition: filter 0.3s;
}

.secret-display.masked {
    filter: blur(7px);
    user-select: none;
    cursor: pointer;
}

.signature-tag {
    color: var(--accent-pink);
    font-weight: 800;
    text-shadow: 0 0 10px rgba(236, 72, 153, 0.45);
    background: rgba(236, 72, 153, 0.14);
    padding: 0 3px;
    border-radius: 3px;
}

.output-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: #fff;
    border: none;
    padding: 0.7rem 1.3rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.88rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    box-shadow: 0 6px 18px -4px var(--primary-glow);
    font-family: var(--font-main);
    transition: transform 0.15s, box-shadow 0.15s, opacity 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px -4px var(--primary-glow);
}

.btn:active { transform: translateY(0); }

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.btn-outline {
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    box-shadow: none;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    box-shadow: 0 6px 18px -4px var(--danger-glow);
}

.btn-danger:hover {
    box-shadow: 0 10px 24px -4px var(--danger-glow);
}

.btn-sm {
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
}

/* ── Main Tabs ───────────────────────────────────────────────── */
.main-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 1rem;
    z-index: 100;
}

.main-tab {
    flex: 1;
    min-width: 140px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.7rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 10px;
    white-space: nowrap;
    font-family: var(--font-main);
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.main-tab:hover { background: var(--stat-badge); }

.main-tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: #fff;
    box-shadow: 0 6px 18px -4px var(--primary-glow);
}

.main-tab-panel { display: none; }
.main-tab-panel.active { display: block; }

/* ── Inner Tabs ──────────────────────────────────────────────── */
.tabs {
    display: flex;
    gap: 0.4rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.5rem;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.55rem 1.1rem;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 8px;
    white-space: nowrap;
    font-family: var(--font-main);
    transition: background 0.2s, color 0.2s;
}

.tab-btn:hover { background: var(--stat-badge); }

.tab-btn.active {
    background: var(--primary);
    color: #fff;
}

.tab-content {
    display: none;
    flex-direction: column;
    gap: 1rem;
}

.tab-content.active { display: flex; }

/* ── JWT Result Panel ────────────────────────────────────────── */
.jwt-result {
    background: var(--secret-box-bg);
    border: 1px solid var(--secret-box-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.8;
    overflow-x: auto;
    display: none;
    position: relative;
}

.jwt-result.visible { display: block; }

.jwt-part-header {
    color: var(--accent-pink);
    font-weight: 700;
}

.jwt-part-payload {
    color: var(--accent-cyan);
}

.jwt-part-signature {
    color: var(--accent-amber);
}

.jwt-field {
    padding: 0.2rem 0;
}

.jwt-field-key {
    color: var(--accent-emerald);
    font-weight: 700;
}

.jwt-field-val {
    color: var(--text-main);
}

.jwt-expired { color: var(--danger); font-weight: 700; }
.jwt-valid { color: var(--accent-emerald); font-weight: 700; }

.jwt-raw {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
    word-break: break-all;
    color: var(--text-muted);
    font-size: 0.78rem;
    max-height: 120px;
    overflow-y: auto;
}

.copy-btn-row {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

/* ── Toast ───────────────────────────────────────────────────── */
#toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 0.75rem 1.4rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.88rem;
    font-family: var(--font-main);
    color: #fff;
    box-shadow: 0 10px 28px -6px rgba(0, 0, 0, 0.35);
    transform: translateY(120px);
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 9999;
}

#toast.show {
    transform: translateY(0);
    opacity: 1;
}

#toast.success { background: var(--accent-emerald); }
#toast.error { background: var(--danger); }
#toast.info { background: var(--primary); }

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 0.5rem 0;
    opacity: 0.7;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 640px) {
    body { padding: 1rem 0.5rem; }
    .header-card, .crypto-card { padding: 1.25rem; }
    .logo-group h1 { font-size: 1.35rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .controls-grid { grid-template-columns: 1fr; }
    #toast { right: 1rem; left: 1rem; text-align: center; }
}