/* --- Global Variables --- */
:root {
    --dark-bg: #1a1a1a;
    --orange-primary: #ff7f00;
    --light-grey: #cccccc;
    --text-color: #f0f0f0;
    --card-bg: #2a2a2a;
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --navbar-bg: rgba(26, 26, 26, 0.9);
    --btn-hover-shadow: rgba(255, 127, 0, 0.4);
    --btn-orange-hover: #e66a00;
}

/* --- Base Styles --- */
body {
    font-family: var(--font-body);
    background-color: var(--dark-bg);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Layout Components --- */
.header {
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #3a3a3a;
    background: rgba(26, 26, 26, 0.9);
}

.logo {
    font-family: var(--font-display);
    color: var(--orange-primary);
    font-size: 1.5rem;
    text-decoration: none;
    font-weight: 700;
    text-shadow: 0 0 10px rgba(255, 127, 0, 0.3);
}

.container {
    margin: auto;
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    max-width: 650px;
    width: 90%;
    border: 1px solid #3a3a3a;
}
h1 {
    font-family: var(--font-display);
    color: var(--orange-primary);
    font-size: 2rem;
    margin-bottom: 10px;
    text-align: center;
}

/* --- Common UI Elements --- */
.highlight { color: var(--orange-primary); font-weight: bold; }

.btn-wallet {
    border: 1px solid var(--orange-primary);
    color: var(--orange-primary);
    background: transparent;
    padding: 8px 18px;
    border-radius: 6px;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: 0.3s;
}
.btn-wallet:hover { background: rgba(255, 127, 0, 0.1); }

.input-group {
    background-color: #3a3a3a;
    border: 1px solid #4a4a4a;
    color: #fff;
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    margin-bottom: 25px;
    box-sizing: border-box;
    font-family: var(--font-body);
}

/* --- Specific Sections --- */
.reward-box {
    margin-bottom: 30px;
    padding: 20px;
    border: 1px solid #4a4a4a;
    border-radius: 8px;
    background: rgba(255, 127, 0, 0.05);
    text-align: center;
}

.challenge-phrase {
    background-color: #3a3a3a;
    padding: 15px;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: #e0e0e0;
    margin: 20px 0;
    border: 1px dashed var(--orange-primary);
    word-break: break-word;
    text-align: center;
}

.amount-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.btn-check { display: none; }
.amount-label {
    background-color: #3a3a3a;
    border: 1px solid #4a4a4a;
    color: var(--light-grey);
    padding: 12px 0;
    text-align: center;
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-weight: bold;
}
.btn-check:checked + .amount-label {
    background-color: var(--orange-primary);
    color: var(--dark-bg);
    border-color: var(--orange-primary);
}

.btn-main {
    background-color: var(--orange-primary);
    color: var(--dark-bg);
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    transition: 0.3s;
}
.btn-main:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(255, 127, 0, 0.4); }

.btn-outline {
    border: 1px solid var(--orange-primary);
    color: var(--orange-primary);
    padding: 12px 25px;
    border-radius: 6px;
    font-weight: bold;
    text-decoration: none;
    transition: 0.3s;
    text-align: center;
}
/* --- Navbar & Brand --- */
.navbar {
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #3a3a3a;
    background: var(--navbar-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand-logo {
    font-family: var(--font-display);
    color: var(--orange-primary);
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    text-shadow: 0 0 10px rgba(255, 127, 0, 0.3);
}

/* --- Main Layout --- */
.main-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 20px;
    flex-grow: 1;
}

/* --- Stake Card --- */
.stake-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid #3a3a3a;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    max-width: 480px;
    width: 100%;
}

.section-label {
    font-family: var(--font-display);
    color: var(--light-grey);
    font-size: 0.8rem;
    margin-bottom: 12px;
    display: block;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* --- Updated Buttons & UI --- */
.btn-connect {
    border: 1px solid var(--orange-primary);
    color: var(--orange-primary);
    background: transparent;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-weight: 600;
    padding: 8px 18px;
    cursor: pointer;
    transition: 0.3s;
}

.btn-connect:hover {
    background: rgba(255, 127, 0, 0.1);
    box-shadow: 0 0 15px rgba(255, 127, 0, 0.2);
}

.btn-submit {
    background-color: var(--orange-primary);
    color: var(--dark-bg);
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
    text-transform: uppercase;
}

.btn-submit:hover {
    background-color: var(--btn-orange-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 20px var(--btn-hover-shadow);
}

/* --- Developer Tag & Info --- */
.dev-tag {
    text-align: center;
    margin-bottom: 15px;
}

.dev-tag span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: #3a3a3a;
    padding: 3px 8px;
    border-radius: 4px;
    color: var(--orange-primary);
}

.footer-info {
    margin-top: 25px;
    font-size: 0.8rem;
    color: #888;
    text-align: center;
    line-height: 1.5;
}

/* 针对 Select 元素的特殊处理 */
select.input-group {
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23ff7f00' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 15px) center;
}

/* --- Wallet Modal Styles --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: none; /* 默认隐藏 */
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--orange-primary);
    box-shadow: 0 0 30px rgba(255, 127, 0, 0.2);
    width: 90%;
    max-width: 400px;
    text-align: center;
    position: relative;
    animation: modalFadeIn 0.3s ease;
}

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

.modal-header {
    font-family: var(--font-display);
    color: var(--orange-primary);
    font-size: 1.2rem;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.modal-body {
    margin-bottom: 25px;
}

.balance-display {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    margin: 15px 0;
    color: #fff;
}

.address-label {
    font-size: 0.8rem;
    color: var(--light-grey);
    background: #3a3a3a;
    padding: 8px;
    border-radius: 4px;
    word-break: break-all;
    margin-bottom: 20px;
}

.btn-disconnect {
    background: transparent;
    color: #ff4444;
    border: 1px solid #ff4444;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-mono);
    width: 100%;
    transition: 0.3s;
}

.btn-disconnect:hover {
    background: rgba(255, 68, 68, 0.1);
}

.close-modal {
    position: absolute;
    right: 15px;
    top: 15px;
    color: var(--light-grey);
    cursor: pointer;
}