/* Base Variables & Reset */
:root {
    --bg-color: #F8FAFC;
    --primary-color: #2563EB;
    --primary-hover: #1D4ED8;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --card-bg: #FFFFFF;
    --border-color: #E2E8F0;
    --error-color: #EF4444;
    --success-color: #10B981;
    --shadow-soft: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
    --radius-main: 18px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 5%;
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color var(--transition-speed);
}

.nav-link:hover {
    color: var(--primary-color);
}

.header-right {
    display: flex;
    gap: 1.5rem;
}

.social-link {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: color var(--transition-speed);
}

.social-link:hover {
    color: var(--primary-color);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-main);
    cursor: pointer;
}

.mobile-nav {
    display: none;
    flex-direction: column;
    background-color: var(--card-bg);
    padding: 1rem 5%;
    border-bottom: 1px solid var(--border-color);
}
.mobile-nav.open {
    display: flex;
    gap: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4rem 5%;
    gap: 2rem;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-main);
    box-shadow: var(--shadow-soft);
    padding: 2.5rem;
    width: 100%;
    max-width: 600px;
    transition: box-shadow var(--transition-speed), transform var(--transition-speed);
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

/* Input Card */
.input-card {
    text-align: center;
}

.input-card h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    font-weight: 700;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.char-input {
    width: 100%;
    max-width: 350px;
    padding: 1rem 1.5rem;
    font-size: 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    outline: none;
    text-align: center;
    transition: all var(--transition-speed);
    font-family: inherit;
    color: var(--text-main);
}

.char-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    border: none;
    transition: all var(--transition-speed);
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #F1F5F9;
    border-color: #CBD5E1;
}

.error-msg {
    color: var(--error-color);
    margin-top: 1rem;
    font-size: 0.9rem;
    min-height: 20px;
}

/* Result Card */
.result-card {
    opacity: 1;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.result-card.hidden {
    display: none;
    opacity: 0;
    transform: translateY(20px);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.result-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-speed);
    padding: 0.5rem;
    border-radius: 8px;
}

.btn-icon:hover {
    color: var(--primary-color);
    background-color: #EFF6FF;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #F8FAFC;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.char-display-item {
    flex-direction: column;
    text-align: center;
    padding: 2rem 1rem;
    background-color: #EFF6FF;
    border-color: #BFDBFE;
}

.char-display-item .label {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.char-value {
    font-size: 4rem;
    line-height: 1;
}

.label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.value {
    font-weight: 600;
    color: var(--text-main);
    font-size: 1.1rem;
}

.highlight-value {
    color: var(--primary-color);
    background-color: #EFF6FF;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-family: monospace;
    font-size: 1.2rem;
}

.type-badge {
    background-color: #F1F5F9;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid #CBD5E1;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 5%;
    background-color: #FFFFFF;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--text-main);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-weight: 500;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}