:root {
    --bg-dark: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-glow: rgba(56, 189, 248, 0.5);
    --accent-purple: rgba(168, 85, 247, 0.5);
    --glass-bg: rgba(30, 41, 59, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --button-primary: linear-gradient(135deg, #38bdf8, #818cf8);
    --button-hover: linear-gradient(135deg, #0ea5e9, #6366f1);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Background Animated Orbs */
.background-orbs {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s infinite alternate;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-glow);
    top: -100px;
    left: -100px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-purple);
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: rgba(45, 212, 191, 0.4);
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 30px) scale(1.1); }
    100% { transform: translate(-30px, -50px) scale(0.9); }
}

.container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem;
    z-index: 10;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.logo i {
    color: #38bdf8;
}

.logo span {
    color: #818cf8;
}

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

/* Glassmorphism Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    padding: 2rem;
}

.translator-inputs {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .translator-inputs {
        flex-direction: row;
        align-items: stretch;
    }
}

.input-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(15, 23, 42, 0.4);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.input-section:focus-within {
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.1);
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1rem;
}

.select-wrapper {
    position: relative;
    width: 60%;
}

select {
    width: 100%;
    appearance: none;
    background: transparent;
    color: var(--text-primary);
    border: none;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    padding-right: 2rem;
    outline: none;
}

select option {
    background-color: var(--bg-dark);
    color: var(--text-primary);
}

.select-wrapper i {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    font-size: 0.8rem;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

textarea {
    width: 100%;
    height: 150px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-family: inherit;
    resize: none;
    outline: none;
    line-height: 1.5;
}

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

.char-count {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Buttons */
.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    font-size: 1rem;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 0;
}

@media (min-width: 768px) {
    .swap-container {
        padding: 0 1rem;
    }
}

.swap-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.swap-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(180deg);
}

.translate-action {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.primary-btn {
    background: var(--button-primary);
    color: white;
    border: none;
    padding: 1rem 3rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition-smooth);
    box-shadow: 0 10px 20px -10px rgba(56, 189, 248, 0.5);
}

.primary-btn:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -10px rgba(56, 189, 248, 0.6);
}

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

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Tooltip Styles */
.tooltip {
    position: relative;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: max-content;
    background-color: rgba(15, 23, 42, 0.9);
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.75rem;
    pointer-events: none;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

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

.toast i {
    color: #34d399;
    font-size: 1.2rem;
}