/* Modern CSS Variables & Design System */
:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(26, 34, 52, 0.65);
    --bg-card-border: rgba(255, 255, 255, 0.08);
    --bg-input: rgba(15, 23, 42, 0.8);
    --bg-hover: rgba(255, 255, 255, 0.05);

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;

    /* Colors for JWT Parts */
    --jwt-header: #c084fc; /* Violet */
    --jwt-header-bg: rgba(192, 132, 252, 0.12);
    --jwt-payload: #38bdf8; /* Cyan */
    --jwt-payload-bg: rgba(56, 189, 248, 0.12);
    --jwt-signature: #4ade80; /* Green */
    --jwt-signature-bg: rgba(74, 222, 128, 0.12);

    /* Accent & Status colors */
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-glow: rgba(139, 92, 246, 0.3);

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --danger: #f43f5e;
    --danger-bg: rgba(244, 63, 94, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;

    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
body.light-theme {
    --bg-main: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-border: rgba(0, 0, 0, 0.08);
    --bg-input: #ffffff;
    --bg-hover: rgba(0, 0, 0, 0.04);

    --text-main: #0f172a;
    --text-muted: #475569;
    --text-dim: #94a3b8;

    --jwt-header: #9333ea;
    --jwt-header-bg: rgba(147, 51, 234, 0.08);
    --jwt-payload: #0284c7;
    --jwt-payload-bg: rgba(2, 132, 199, 0.08);
    --jwt-signature: #16a34a;
    --jwt-signature-bg: rgba(22, 163, 74, 0.08);

    --accent-glow: rgba(139, 92, 246, 0.15);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    line-height: 1.6;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(139, 92, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(56, 189, 248, 0.08) 0%, transparent 40%);
    background-attachment: fixed;
}

/* Header */
.app-header {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--bg-card-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 12px 24px;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent), #06b6d4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
}

.badge-local {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 20px;
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
    font-weight: 600;
    text-transform: uppercase;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.security-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--success);
    background: var(--success-bg);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 6px 14px;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.security-badge:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.shield-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
    100% { opacity: 1; transform: scale(1); }
}

.icon-btn {
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--accent);
}

/* Main Layout */
.main-container {
    max-width: 1400px;
    margin: 24px auto;
    padding: 0 24px;
}

/* Security Banner */
.security-banner {
    background: rgba(139, 92, 246, 0.08);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    margin-bottom: 20px;
}

.banner-content {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.banner-content svg {
    color: var(--accent);
    flex-shrink: 0;
}

.banner-content strong {
    color: var(--text-main);
}

/* Sample Bar */
.sample-bar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.sample-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-right: 4px;
}

.btn-sample {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    color: var(--text-main);
    padding: 6px 14px;
    font-size: 0.825rem;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sample:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: #fff;
}

.btn-clear {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-dim);
    padding: 6px 14px;
    font-size: 0.825rem;
    border-radius: 20px;
    cursor: pointer;
    margin-left: auto;
    transition: var(--transition);
}

.btn-clear:hover {
    color: var(--danger);
    background: var(--danger-bg);
}

/* Grid Grid Panel Layout */
.workspace-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
}

@media (max-width: 992px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
}

/* Panel Styles */
.panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--bg-card-border);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.token-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.825rem;
    padding: 4px 10px;
    border-radius: 12px;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-dim);
}

.status-indicator.valid {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
}

.status-indicator.invalid {
    background: var(--danger);
    box-shadow: 0 0 6px var(--danger);
}

/* JWT Textarea & Overlay */
.jwt-input-wrapper {
    position: relative;
    min-height: 240px;
    border-radius: var(--radius-md);
    border: 1px solid var(--bg-card-border);
    background: var(--bg-input);
    overflow: hidden;
    margin-bottom: 16px;
    transition: var(--transition);
}

.jwt-input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.jwt-highlight-overlay, #jwtInput {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    padding: 16px;
    width: 100%;
    height: 100%;
    min-height: 240px;
    white-space: pre-wrap;
    word-break: break-all;
    overflow-y: auto;
}

.jwt-highlight-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    color: transparent;
}

#jwtInput {
    position: relative;
    background: transparent;
    color: var(--text-main);
    border: none;
    outline: none;
    resize: vertical;
    caret-color: var(--accent);
}

/* Color Highlighting Tokens */
.jwt-part-header {
    color: var(--jwt-header);
    background: var(--jwt-header-bg);
    border-radius: 3px;
}

.jwt-part-payload {
    color: var(--jwt-payload);
    background: var(--jwt-payload-bg);
    border-radius: 3px;
}

.jwt-part-signature {
    color: var(--jwt-signature);
    background: var(--jwt-signature-bg);
    border-radius: 3px;
}

.jwt-dot {
    color: var(--text-dim);
    font-weight: bold;
}

/* Token Legend */
.token-legend {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    font-size: 0.8rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
}

.legend-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.legend-header .dot { background: var(--jwt-header); }
.legend-payload .dot { background: var(--jwt-payload); }
.legend-signature .dot { background: var(--jwt-signature); }

/* Signature Box */
.signature-box {
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 16px;
}

.sig-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.sig-header label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 6px;
}

.verif-result-badge {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 12px;
    background: var(--bg-hover);
    color: var(--text-dim);
    border: 1px solid var(--bg-card-border);
}

.verif-result-badge.valid {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.3);
}

.verif-result-badge.invalid {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: rgba(244, 63, 94, 0.3);
}

.sig-input-group {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.sig-input-group input {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    color: var(--text-main);
    padding: 8px 12px;
    font-size: 0.875rem;
    font-family: var(--font-mono);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
}

.sig-input-group input:focus {
    border-color: var(--jwt-signature);
}

.btn-sm {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    color: var(--text-main);
    padding: 0 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.sig-hint {
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* Summary Card */
.summary-card {
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
}

.summary-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--bg-card-border);
}

.summary-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
}

.expiry-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 12px;
}

.expiry-badge.active {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.expiry-badge.expired {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(244, 63, 94, 0.3);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

@media (max-width: 576px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
}

.summary-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--bg-card);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--bg-card-border);
}

.sum-label {
    font-size: 0.725rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sum-val {
    font-size: 0.85rem;
    font-family: var(--font-mono);
    color: var(--text-main);
    word-break: break-all;
}

.highlight-timer {
    color: var(--accent);
    font-weight: 600;
}

/* Code Sections */
.code-section {
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid var(--bg-card-border);
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
}

.header-color { color: var(--jwt-header); }
.payload-color { color: var(--jwt-payload); }
.signature-color { color: var(--jwt-signature); }

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.header-color .badge-dot { background: var(--jwt-header); }
.payload-color .badge-dot { background: var(--jwt-payload); }
.signature-color .badge-dot { background: var(--jwt-signature); }

.btn-copy {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-copy:hover {
    color: var(--text-main);
    border-color: var(--accent);
}

.json-code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    padding: 16px;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-main);
    line-height: 1.5;
    max-height: 320px;
    overflow-y: auto;
}

/* Syntax Highlighting for JSON Output */
.json-key { color: #f472b6; }
.json-string { color: #38bdf8; }
.json-number { color: #fbbf24; }
.json-boolean { color: #c084fc; }
.json-null { color: #94a3b8; }

/* Signature Display */
.signature-display {
    color: var(--jwt-signature);
}

.sig-secret-placeholder {
    color: var(--warning);
    background: var(--warning-bg);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 520px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    transform: translateY(20px);
    transition: var(--transition);
}

.modal-backdrop.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-header h3 {
    font-size: 1.1rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.modal-body ul {
    padding-left: 20px;
}

.modal-body li {
    margin-bottom: 8px;
}

.code-snippet-box {
    background: var(--bg-input);
    padding: 10px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--accent-hover);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg-card);
    border: 1px solid var(--accent);
    color: var(--text-main);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    font-size: 0.875rem;
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
}

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