:root {
    --apple-blue: #0071e3;
    --apple-blue-hover: #0077ed;
    --bg-color: #f5f5f7;
    --card-bg: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --input-bg: #f5f5f7;
    --border-light: rgba(0, 0, 0, 0.1);
    --focus-ring: 0 0 0 4px rgba(0, 113, 227, 0.2);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.08);
    --radius-l: 20px;
    --radius-m: 12px;
    --radius-s: 8px;
    --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Menlo", "Monaco", "Courier New", monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 60px 20px;
    flex: 1;
}

/* Header Typography */
header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInDown 0.8s ease-out;
}

header h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.005em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

header h1 i {
    color: var(--apple-blue);
    margin-right: 12px;
}

header p {
    font-size: 21px;
    line-height: 1.4;
    font-weight: 400;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Layout */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-l);
    padding: 40px;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

/* Form Elements */
.form-group {
    margin-bottom: 28px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

label i {
    margin-right: 6px;
    color: var(--apple-blue);
}

textarea, select {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid transparent;
    border-radius: var(--radius-m);
    padding: 16px;
    font-size: 15px;
    color: var(--text-primary);
    transition: all 0.2s ease;
    resize: none;
}

textarea {
    font-family: var(--font-mono);
    line-height: 1.6;
    height: 180px;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2386868b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.2em 1.2em;
    padding-right: 2.5rem;
    cursor: pointer;
    height: 52px;
}

textarea:focus, select:focus {
    outline: none;
    background-color: #fff;
    border-color: var(--apple-blue);
    box-shadow: var(--focus-ring);
}

textarea::placeholder {
    color: #a1a1a6;
}

/* Buttons */
button {
    cursor: pointer;
    border: none;
    font-family: var(--font-stack);
    transition: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1);
}

#generateBtn {
    width: 100%;
    padding: 18px;
    background-color: var(--apple-blue);
    color: white;
    font-size: 17px;
    font-weight: 600;
    border-radius: var(--radius-m);
    margin-top: 10px;
}

#generateBtn:hover {
    background-color: var(--apple-blue-hover);
    transform: scale(1.01);
}

#generateBtn:active {
    transform: scale(0.99);
}

/* Secondary & Small Buttons */
.btn-small {
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    background-color: rgba(0, 113, 227, 0.1);
    color: var(--apple-blue);
    border-radius: 20px;
    margin-left: 8px;
}

.btn-small:hover {
    background-color: rgba(0, 113, 227, 0.2);
}

.btn-secondary {
    padding: 14px;
    background-color: var(--input-bg);
    color: var(--apple-blue);
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-m);
    width: 100%;
}

.btn-secondary:hover {
    background-color: #e8e8ed;
    color: var(--apple-blue-hover);
}

.quick-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 8px;
}

/* Output Section Specifics */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
}

.output-header label {
    margin-bottom: 0;
}

.stats {
    font-size: 13px;
    color: var(--text-secondary);
    background-color: var(--input-bg);
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 500;
}

#resultOutput {
    height: 450px;
    background-color: var(--input-bg);
    border: none;
    margin-bottom: 28px;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Tooltip */
.tooltip {
    color: var(--text-secondary);
    margin-left: 6px;
    transition: color 0.2s;
    cursor: help;
}

.tooltip:hover {
    color: var(--apple-blue);
}

/* Footer */
footer {
    text-align: center;
    margin-top: auto;
    padding-top: 60px;
    color: var(--text-secondary);
    font-size: 13px;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px dotted var(--text-secondary);
    transition: all 0.2s;
}

footer a:hover {
    color: var(--apple-blue);
    border-bottom-color: var(--apple-blue);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #d2d2d7;
    border-radius: 5px;
    border: 3px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
    background: #86868b;
}