:root {
    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --bg: #0C0C0C;
    --surface: #151515;
    --surface-2: #1E1E1E;
    --border: rgba(255, 255, 255, .06);
    --border-hover: rgba(255, 255, 255, .12);
    --header-color: #FF6B6B;
    --payload-color: #C084FC;
    --sig-color: #60A5FA;
    --primary: #10B981;
    --accent: #F59E0B;
    --text: #D4D4D4;
    --text-muted: #737373;
    --text-dim: #525252;
    --green: #4ADE80;
    --red: #F87171;
    --radius: 8px;
    --radius-sm: 4px
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6
}

.header {
    padding: .7rem 2rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 50
}

.header-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between
}

.logo {
    display: flex;
    align-items: center;
    gap: .5rem
}

.logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem
}

.logo-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text)
}

.badge {
    font-size: .55rem;
    font-weight: 600;
    padding: .1rem .3rem;
    border-radius: 3px;
    background: rgba(16, 185, 129, .1);
    color: var(--primary);
    text-transform: uppercase
}

.header-actions {
    display: flex;
    gap: .3rem
}

.main {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem 2rem 3rem
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: .75rem
}

.section-title {
    font-size: .65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text-muted);
    margin-bottom: .4rem
}

.decoded-header {
    color: var(--header-color)
}

.decoded-payload {
    color: var(--payload-color)
}

.decoded-sig {
    color: var(--sig-color)
}

.token-input {
    width: 100%;
    resize: vertical;
    padding: .5rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: .75rem;
    outline: none;
    word-break: break-all
}

.token-input:focus {
    border-color: rgba(245, 158, 11, .3)
}

.verify-row {
    display: flex;
    gap: .4rem;
    margin-top: .4rem
}

.secret-input {
    flex: 1;
    padding: .3rem .5rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: .75rem;
    outline: none
}

.verify-result {
    margin-top: .4rem;
    padding: .3rem .5rem;
    border-radius: var(--radius-sm);
    font-size: .75rem;
    font-weight: 600
}

.verify-pass {
    background: rgba(74, 222, 128, .06);
    border: 1px solid rgba(74, 222, 128, .15);
    color: var(--green)
}

.verify-fail {
    background: rgba(248, 113, 113, .06);
    border: 1px solid rgba(248, 113, 113, .15);
    color: var(--red)
}

.decoded-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: .5rem;
    margin-bottom: .75rem
}

.decoded-card {
    min-height: 60px
}

.json-block {
    background: var(--bg);
    padding: .5rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--text);
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.5
}

.sig-display {
    font-family: var(--font-mono);
    font-size: .65rem;
    color: var(--sig-color);
    word-break: break-all;
    opacity: .7
}

.time-badge {
    display: inline-block;
    font-size: .6rem;
    padding: .05rem .2rem;
    background: rgba(245, 158, 11, .06);
    border-radius: 2px;
    color: var(--accent);
    margin-left: .2rem
}

.gen-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .4rem
}

.field {
    display: flex;
    flex-direction: column;
    gap: .1rem
}

.field label {
    font-size: .62rem;
    color: var(--text-muted);
    font-weight: 500
}

.field input {
    padding: .3rem .4rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: .75rem;
    outline: none
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: .25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: .75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .15s ease
}

.btn--primary {
    background: var(--primary);
    color: #0C0C0C;
    padding: .4rem .7rem
}

.btn--primary:hover {
    opacity: .9
}

.btn--accent {
    background: var(--accent);
    color: #0C0C0C;
    padding: .3rem .5rem
}

.btn--ghost {
    background: transparent;
    color: var(--text-muted);
    padding: .3rem .5rem
}

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

.btn--sm {
    font-size: .68rem;
    padding: .2rem .35rem
}

.hidden {
    display: none !important
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(120%);
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: .5rem .85rem;
    border-radius: var(--radius-sm);
    font-size: .78rem;
    font-weight: 500;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .6);
    opacity: 0;
    pointer-events: none;
    transition: all .4s cubic-bezier(.16, 1, .3, 1);
    z-index: 100
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0)
}

@media(max-width:600px) {
    .header {
        padding: .7rem 1rem
    }

    .main {
        padding: 1rem
    }

    .decoded-grid {
        grid-template-columns: 1fr
    }

    .gen-grid {
        grid-template-columns: 1fr
    }
}