/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --header-color: #f472b6;
    --payload-color: #a78bfa;
    --signature-color: #38bdf8;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --border-radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
}

html {
    font-size: 16px;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: 8px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--header-color), var(--payload-color), var(--signature-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Main Content */
main {
    flex: 1;
}

/* Input Section */
.input-section {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.input-section label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--background-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    resize: vertical;
    transition: border-color 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.button-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.secondary {
    background-color: var(--surface-light);
    color: var(--text-primary);
}

.btn.secondary:hover {
    background-color: var(--border-color);
}

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

/* Error Section */
.error-section {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.error-message {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--error-color);
}

.error-icon {
    font-size: 1.25rem;
}

/* Results Section */
.results-section {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Token Parts Overview */
.token-parts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.part {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.part h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.header-part {
    border-top: 3px solid var(--header-color);
}

.payload-part {
    border-top: 3px solid var(--payload-color);
}

.signature-part {
    border-top: 3px solid var(--signature-color);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge.algorithm {
    background-color: rgba(244, 114, 182, 0.2);
    color: var(--header-color);
}

.badge.type {
    background-color: rgba(167, 139, 250, 0.2);
    color: var(--payload-color);
}

#signature-badge {
    background-color: rgba(56, 189, 248, 0.2);
    color: var(--signature-color);
}

/* Decoded Sections */
.decoded-sections {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.decoded-box {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: var(--surface-light);
    border-bottom: 1px solid var(--border-color);
}

.box-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.header-color {
    background-color: var(--header-color);
}

.payload-color {
    background-color: var(--payload-color);
}

.signature-color {
    background-color: var(--signature-color);
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1rem;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.copy-btn:hover {
    opacity: 1;
}

.json-content, .signature-content {
    padding: 1rem;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

/* JSON Syntax Highlighting */
.json-key {
    color: var(--header-color);
}

.json-string {
    color: var(--success-color);
}

.json-number {
    color: var(--signature-color);
}

.json-boolean {
    color: var(--warning-color);
}

.json-null {
    color: var(--text-secondary);
}

/* Token Info */
.token-info {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.token-info h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
}

.info-value.expired {
    color: var(--error-color);
}

.info-value.valid {
    color: var(--success-color);
}

.info-value.warning {
    color: var(--warning-color);
}

/* Signature Verification */
.signature-verification {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.signature-verification h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.verification-input {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.verification-input label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.verification-input input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--background-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    transition: border-color 0.2s ease;
}

.verification-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.verification-input input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.verification-result {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.verification-result.valid {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.verification-result.invalid {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.verification-icon {
    font-size: 1.25rem;
}

/* Footer */
footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .token-parts {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .input-section,
    .token-info,
    .signature-verification {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .logo-section {
        flex-direction: column;
        gap: 0.5rem;
    }

    .logo {
        width: 40px;
        height: 40px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection Styling */
::selection {
    background-color: var(--primary-color);
    color: white;
}