:root {
    --primary: #64748B;
    --secondary: #94A3B8;
    --accent: #38BDF8;
    --background: #0F1219;

    --glass-bg: rgba(15, 18, 25, 0.65);
    --glass-border: rgba(56, 189, 248, 0.15);

    --card-bg: rgba(100, 116, 139, 0.08);
    --card-hover: rgba(56, 189, 248, 0.08);

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    min-height: 100vh;
}

.glass-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% -20%, rgba(56, 189, 248, 0.08), transparent 60%),
        radial-gradient(circle at -20% 100%, rgba(100, 116, 139, 0.05), transparent 50%);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.layout {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Input Area */
.input-panel {
    display: flex;
    flex-direction: column;
}

textarea {
    width: 100%;
    height: 120px;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1.1rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

textarea::placeholder {
    color: rgba(148, 163, 184, 0.5);
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    margin-top: 0.5rem;
}

#char-count {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.outline-btn {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--text-muted);
}

.outline-btn:hover {
    color: var(--text-main);
    border-color: var(--secondary);
    background: rgba(255, 255, 255, 0.05);
}

.hidden {
    display: none !important;
}

/* Output Area */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 1.25rem;
    color: var(--accent);
    font-weight: 600;
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

.style-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.style-card:hover {
    background: var(--card-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.style-card::after {
    content: 'Copy';
    position: absolute;
    top: 50%;
    right: 1.25rem;
    transform: translateY(-50%);
    background: var(--accent);
    color: #000;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    opacity: 0;
    transition: opacity 0.2s;
}

.style-card:hover::after {
    opacity: 1;
}

.style-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.style-output {
    font-size: 1.2rem;
    line-height: 1.5;
    word-break: break-word;
    white-space: pre-wrap;
    padding-right: 4rem;
    /* leave space for Copy badge */
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-main);
    color: #000;
    padding: 0.75rem 1.25rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
}

.toast.show {
    opacity: 1;
    transform: translate(-50%, -10px);
}

@media (min-width: 600px) {
    .styles-grid {
        grid-template-columns: 1fr 1fr;
    }
}