:root {
    --font-sans: 'Inter', -apple-system, sans-serif;
    --bg: #0F172A;
    --surface: #1E293B;
    --surface-2: #283548;
    --border: rgba(245, 158, 11, .12);
    --border-hover: rgba(245, 158, 11, .3);
    --primary: #F59E0B;
    --primary-glow: rgba(245, 158, 11, .2);
    --accent: #FBBF24;
    --text: #F1F5F9;
    --text-muted: #94A3B8;
    --text-dim: #64748B;
    --green: #4ADE80;
    --red: #F87171;
    --orange: #FB923C;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: .25s ease
}

*,
*::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;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    background-image: radial-gradient(ellipse at 20% 0%, rgba(245, 158, 11, .05) 0%, transparent 50%), radial-gradient(ellipse at 80% 100%, rgba(251, 191, 36, .04) 0%, transparent 50%)
}

.header {
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    background: rgba(15, 23, 42, .8);
    position: sticky;
    top: 0;
    z-index: 50
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem
}

.logo {
    display: flex;
    align-items: center;
    gap: .75rem
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, .1);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-size: 1.25rem
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text
}

.header-tagline {
    font-size: .8rem;
    color: var(--text-muted)
}

.main {
    flex: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 2rem 3rem;
    width: 100%
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    animation: fadeIn .5s ease backwards
}

.section-title {
    font-size: .8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text-muted);
    margin-bottom: .85rem
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .75rem
}

.full {
    grid-column: 1/-1
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: .3rem
}

.form-group label {
    font-size: .75rem;
    font-weight: 500;
    color: var(--text-muted)
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: .5rem .75rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: .85rem;
    outline: none;
    transition: border-color var(--transition);
    resize: vertical
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow)
}

/* Validation */
.validation-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: .35rem
}

.val-item {
    padding: .4rem .65rem;
    border-radius: var(--radius-sm);
    font-size: .8rem;
    display: flex;
    align-items: center;
    gap: .5rem
}

.val-pass {
    background: rgba(74, 222, 128, .08);
    color: var(--green)
}

.val-warn {
    background: rgba(251, 146, 60, .08);
    color: var(--orange)
}

.val-fail {
    background: rgba(248, 113, 113, .08);
    color: var(--red)
}

/* Preview Grid */
.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem
}

.preview-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    animation: fadeIn .4s ease backwards
}

.preview-label {
    font-size: .7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--text-dim);
    margin-bottom: .65rem
}

/* Twitter */
.twitter-preview {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid #2F3336;
    background: #000
}

.tw-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block
}

.tw-info {
    padding: .65rem .85rem
}

.tw-url {
    font-size: .7rem;
    color: #71767B
}

.tw-title {
    font-size: .85rem;
    font-weight: 600;
    color: #E7E9EA;
    margin: .15rem 0
}

.tw-desc {
    font-size: .75rem;
    color: #71767B;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden
}

/* Facebook */
.fb-preview {
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #3E4042;
    background: #242526
}

.fb-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block
}

.fb-info {
    padding: .5rem .75rem
}

.fb-url {
    font-size: .65rem;
    color: #B0B3B8;
    text-transform: uppercase
}

.fb-title {
    font-size: .85rem;
    font-weight: 600;
    color: #E4E6EB;
    margin: .1rem 0
}

.fb-desc {
    font-size: .75rem;
    color: #B0B3B8;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden
}

/* LinkedIn */
.li-preview {
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #38434F;
    background: #1B2838
}

.li-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block
}

.li-info {
    padding: .5rem .75rem
}

.li-title {
    font-size: .85rem;
    font-weight: 600;
    color: #E7E9EA
}

.li-url {
    font-size: .65rem;
    color: rgba(255, 255, 255, .5);
    margin-top: .1rem
}

/* Slack */
.slack-preview {
    display: flex;
    gap: 0;
    background: #1A1D21;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #383A3F
}

.slack-bar {
    width: 4px;
    background: var(--primary);
    flex-shrink: 0
}

.slack-info {
    padding: .65rem .85rem;
    flex: 1
}

.slack-site {
    font-size: .65rem;
    color: #9B9B9F;
    font-weight: 600
}

.slack-title {
    font-size: .85rem;
    font-weight: 700;
    color: #1D9BD1;
    margin: .1rem 0
}

.slack-desc {
    font-size: .75rem;
    color: #D1D2D3;
    margin-bottom: .5rem
}

.slack-img {
    width: 100%;
    max-height: 120px;
    object-fit: cover;
    border-radius: 4px
}

/* Discord */
.discord-preview {
    display: flex;
    gap: 0;
    background: #2F3136;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #40444B
}

.dc-bar {
    width: 4px;
    background: var(--primary);
    flex-shrink: 0
}

.dc-info {
    padding: .65rem .85rem;
    flex: 1
}

.dc-site {
    font-size: .65rem;
    color: #B9BBBE;
    font-weight: 600
}

.dc-title {
    font-size: .85rem;
    font-weight: 700;
    color: #00AFF4;
    margin: .1rem 0
}

.dc-desc {
    font-size: .75rem;
    color: #DCDDDE;
    margin-bottom: .5rem
}

.dc-img {
    width: 100%;
    max-height: 120px;
    object-fit: cover;
    border-radius: 4px
}

.code-block {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .85rem;
    font-size: .7rem;
    line-height: 1.5;
    color: var(--text-muted);
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
    font-family: 'JetBrains Mono', monospace
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: .85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s ease;
    white-space: nowrap
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #1a1a2e;
    padding: .6rem 1.1rem;
    font-weight: 600;
    box-shadow: 0 4px 16px var(--primary-glow)
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--primary-glow)
}

.btn--ghost {
    background: transparent;
    color: var(--text-muted);
    padding: .4rem .75rem
}

.btn--ghost:hover {
    background: rgba(245, 158, 11, .1);
    color: var(--text)
}

.btn--sm {
    font-size: .8rem;
    padding: .35rem .65rem
}

.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: .75rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: .85rem;
    font-weight: 500;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .4);
    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)
}

.footer {
    text-align: center;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: .8rem
}

@media(max-width:768px) {
    .header {
        padding: 1rem
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: .25rem
    }

    .main {
        padding: 1rem
    }

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

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}