/* 現代化登入頁面樣式 */

/* 基礎動畫定義 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    33% {
        transform: translateY(-10px) rotate(1deg);
    }
    66% {
        transform: translateY(-5px) rotate(-1deg);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(225, 169, 204, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(225, 169, 204, 0.6);
    }
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 玻璃擬態效果 */
.glass-morphism {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.glass-morphism-strong {
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

/* 漸層文字效果 */
.gradient-text-primary {
    background: linear-gradient(135deg, #e1a9cc 0%, #9e96ca 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-shift 3s ease infinite;
}

.gradient-text-secondary {
    background: linear-gradient(135deg, #e1a9cc 0%, #9e96ca 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 輸入框焦點效果 */
.input-modern {
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-modern::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #e1a9cc, #c1a2b9, #9e96ca);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-modern:focus-within::before {
    width: 100%;
}

.input-modern:focus-within {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(225, 169, 204, 0.15);
}

/* 按鈕動畫效果 */
.btn-modern {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-modern:hover::before {
    left: 100%;
}

.btn-modern:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.btn-modern:active {
    transform: translateY(-1px) scale(1.01);
}

/* 粒子動畫 */
.particle-system {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.particle {
    position: absolute;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.1) 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 6s ease-in-out infinite;
}

.particle:nth-child(odd) {
    animation-duration: 8s;
    animation-delay: 2s;
}

.particle:nth-child(even) {
    animation-duration: 10s;
    animation-delay: 4s;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .glass-morphism {
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
    }
    
    .btn-modern:hover {
        transform: translateY(-2px) scale(1.01);
    }
}

/* 載入動畫 */
.loading-dots {
    display: inline-block;
}

.loading-dots::after {
    content: '';
    animation: dots 1.5s steps(5, end) infinite;
}

@keyframes dots {
    0%, 20% {
        content: '';
    }
    40% {
        content: '.';
    }
    60% {
        content: '..';
    }
    80%, 100% {
        content: '...';
    }
}

/* 成功/錯誤狀態動畫 */
.status-success {
    animation: successPulse 0.6s ease-out;
}

.status-error {
    animation: errorShake 0.6s ease-out;
}

@keyframes successPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes errorShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

/* 深色模式支援 */
@media (prefers-color-scheme: dark) {
    .glass-morphism {
        background: rgba(0, 0, 0, 0.2);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* 無障礙支援 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}