/*
 * Project:  Tic-Tac-Toe Game
 * Author:   Ramazan Çetinkaya
 * GitHub:   https://github.com/ramazancetinkaya
 *
 * Copyright (c) 2025 Ramazan Çetinkaya
 * Released under the MIT License.
 */

/* ================================================
   TABLE OF CONTENTS
   ================================================
   1. Root & Variables
   2. Base & Reset Styles
   3. Layout & Main Structure
   4. Components
   5. Accessibility
   6. Media Queries (Responsiveness)
   ================================================ */

/* 1. Root & Variables 
   Defines the color palette, fonts, and shadows for the entire application.
*/
:root {
    --clr-dark-navy: #000000;
    --clr-semi-dark-navy: #006341;
    --clr-silver: #ffffff;
    --clr-silver-hover: #dbe8ed;
    --clr-light-blue: #c55de5;
    --clr-light-blue-hover: #65e9e4;
    --clr-light-yellow: #00ff6a;
    --clr-light-yellow-hover: #c55De8;

    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --fw-bold: 700;
    --fw-medium: 500;

    --shadow-sm: 0px 4px 0px rgba(0, 0, 0, 0.25);
    --shadow-md: 0px 8px 0px rgba(0, 0, 0, 0.25);
}

/* 2. Base & Reset Styles 
   Establishes a consistent baseline across all browsers.
*/
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

body {
    font-family: var(--font-family);
    background-color: none;
    color: var(--clr-silver);
    display: grid;
    place-items: center;
    padding: 1.5rem;
}

h1,
h2,
h3,
h4 {
    text-transform: uppercase;
    font-weight: var(--fw-bold);
}

button {
    font-family: inherit;
    border: none;
    cursor: pointer;
    border-radius: 10px;
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    transition: background-color 0.2s ease-in-out, transform 0.1s ease-in-out;
}

button:active {
    transform: translateY(2px);
}

/* 3. Layout & Main Structure 
   Styles for the main containers and overall page layout.
*/
.main-container {
    width: 100%;
    max-width: 460px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    text-align: center;
}

.icon-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.mark {
    display: inline-block;
    width: 26px;
    height: 26px;
    object-fit: contain;
}

.icon-logo .mark {
    width: 28px;
    height: 28px;
}

/* Picker Card Buttons */
.picker-toggle button {
    background-color: transparent;
    border-radius: 10px;
    padding: 10px;
    transition: background-color 0.2s;
}

.picker-toggle button.active {
    background-color: var(--clr-silver);
}

.picker-toggle img {
    width: 32px;
    height: 32px;
    display: block;
}

/* 4. Components 
   Styles for individual UI elements like cards, buttons, the board, and modals.
*/

/* --- Utility & Buttons --- */
.hidden {
    display: none !important;
}

.btn {
    padding: 1rem;
    font-size: 1rem;
    letter-spacing: 1px;
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-yellow {
    background-color: var(--clr-light-yellow);
    color: var(--clr-dark-navy);
}

.btn-yellow:hover {
    background-color: var(--clr-light-yellow-hover);
}

.btn-silver {
    background-color: var(--clr-silver);
    color: var(--clr-dark-navy);
}

.btn-silver:hover {
    background-color: var(--clr-silver-hover);
}

/* --- Start Menu --- */
.start-menu {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
}

.game-meta {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.game-logo img {
    width: min(140px, 70vw);
    height: auto;
    display: block;
    margin: 0 auto;
}

#game-title {
    font-size: 3rem;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
}

#game-tagline {
    font-size: 1.25rem;
    color: #01963A;
    font-weight: var(--fw-bold);
    letter-spacing: 1.5px;
    margin-top: 0.5rem;
    text-transform: uppercase;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* --- Player Details Form & Picker Card --- */
.picker-card,
.player-details-card {
    background-color: var(--clr-semi-dark-navy);
    box-shadow: var(--shadow-md);
    border-radius: 15px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

#player-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-row .form-group {
    flex: 1;
}

input[type="text"],
input[type="email"],
input[type="tel"] {
    width: 100%;
    background-color: var(--clr-dark-navy);
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    font-family: var(--font-family);
    font-weight: var(--fw-bold);
    color: var(--clr-silver);
    outline: none;
    transition: border-color 0.2s ease;
}

input::placeholder {
    color: rgba(168, 191, 201, 0.5);
    opacity: 1;
    font-weight: normal;
}

input:focus {
    border-color: var(--clr-light-yellow);
}

input.input-error {
    border-color: #ff6b6b;
}

input.input-error:focus {
    border-color: #ff6b6b;
}

.row-consent {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.consent-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    color: var(--clr-silver);
    cursor: pointer;
    text-align: left;
    line-height: 1.3;
}

.consent-label a {
    color: var(--clr-light-yellow);
    white-space: nowrap;
}

.consent-label a:visited {
    color: var(--clr-light-yellow);
}

input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background-color: var(--clr-dark-navy);
    border: 2px solid var(--clr-silver);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    display: grid;
    place-items: center;
}

input[type="checkbox"]:checked {
    background-color: var(--clr-light-yellow);
    border-color: var(--clr-light-yellow);
}

input[type="checkbox"]:checked::after {
    content: '✔';
    font-size: 0.8rem;
    color: var(--clr-dark-navy);
    font-weight: bold;
}

.form-message {
    font-size: 0.85rem;
    color: #ff6b6b;
    text-align: center;
    min-height: 1.2em;
    /* Reserve space */
}

/* --- Game Screen --- */
.game-screen {
    width: 100%;
}

.game-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    margin-bottom: 1.25rem;
}

.turn-indicator {
    background-color: var(--clr-semi-dark-navy);
    padding: 0.5rem 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-self: center;
}

.turn-indicator .mark {
    width: 22px;
    height: 22px;
}

.btn-restart {
    background-color: var(--clr-silver);
    color: var(--clr-dark-navy);
    width: 52px;
    height: 52px;
    font-size: 1.75rem;
    display: grid;
    place-items: center;
    justify-self: end;
    box-shadow: var(--shadow-sm);
}

.btn-restart:hover {
    background-color: var(--clr-silver-hover);
}

.thinking-indicator {
    min-height: 24px;
    /* Prevents layout shift */
    margin-bottom: 1.25rem;
    font-weight: var(--fw-medium);
    letter-spacing: 1px;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.thinking-indicator.visible {
    opacity: 1;
}

.game-toast {
    background-color: var(--clr-semi-dark-navy);
    border-radius: 12px;
    padding: 0.85rem 1.75rem 0.85rem 1rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
    color: var(--clr-silver);
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    text-align: left;
    position: relative;
    max-height: 240px;
    overflow: hidden;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.35s ease, transform 0.35s ease, max-height 0.35s ease, margin 0.35s ease,
        padding 0.35s ease;
}

.game-toast.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(6px);
    max-height: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
}

.game-toast-dismiss {
    position: absolute;
    top: 0.55rem;
    right: 0.55rem;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
}

.game-toast-dismiss:hover {
    background: rgba(255, 255, 255, 0.22);
}

.game-toast-cta {
    align-self: flex-start;
    background-color: var(--clr-light-yellow);
    color: var(--clr-dark-navy);
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    letter-spacing: 0.08rem;
    font-size: 0.75rem;
    text-decoration: none;
}

.game-toast-cta.hidden {
    display: none;
}

.game-toast-microcopy {
    font-size: 0.8rem;
    color: #9fb2bd;
}

.game-toast-microcopy.hidden {
    display: none;
}

/* --- Game Board & Cells --- */
.game-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

.board-cell {
    background-color: var(--clr-semi-dark-navy);
    aspect-ratio: 1 / 1;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
    position: relative;
}

.board-cell img {
    width: 60%;
    height: 60%;
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
}

.board-cell.show img {
    opacity: 1;
    transform: scale(1);
}

.board-cell::after {
    content: '';
    position: absolute;
    inset: 0;
    background-repeat: no-repeat;
    background-position: center;
    background-size: 42%;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
}

.board-cell.x-hover:not(.x):not(.o):hover::after {
    background-image: url("assets/x.svg");
    opacity: 0.25;
}

.board-cell.o-hover:not(.x):not(.o):hover::after {
    background-image: url("assets/o.svg");
    opacity: 0.25;
}

.win-line.x {
    background-color: var(--clr-light-blue);
}

.win-line.o {
    background-color: var(--clr-light-yellow);
}

.win-line.x i,
.win-line.o i {
    color: var(--clr-dark-navy);
}

/* --- Score Cards --- */
.game-footer {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.score-card {
    border-radius: 15px;
    padding: 0.8rem;
    color: var(--clr-dark-navy);
}

.score-card p {
    font-size: 0.875rem;
}

.score-card .score {
    font-size: 1.5rem;
    font-weight: var(--fw-bold);
}

#player-score-card {
    background-color: var(--clr-light-blue);
}

#tie-score-card {
    background-color: var(--clr-silver);
}

#cpu-score-card {
    background-color: var(--clr-light-yellow);
}

/* --- Modals --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: grid;
    place-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--clr-semi-dark-navy);
    padding: 2.5rem 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.modal-overlay.show .modal-content {
    transform: scale(1);
}

#modal-result-text {
    font-size: 1.1rem;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
    color: var(--clr-silver);
}

#modal-result-text.winner-flash {
    color: #01FF6B;
    font-size: 1.6rem;
    letter-spacing: 0.3rem;
    animation: winnerFlash 1.1s ease-in-out infinite;
    text-shadow: 0 0 12px rgba(1, 255, 107, 0.6);
}

.modal-prompt-text {
    max-width: 420px;
    text-align: center;
    font-size: 0.95rem;
    color: var(--clr-silver);
    line-height: 1.5;
}

.modal-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.6rem;
    border-radius: 999px;
    background-color: var(--clr-light-yellow);
    color: var(--clr-dark-navy);
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    font-size: 0.8rem;
    text-decoration: none;
}

.modal-cta.hidden {
    display: none;
}

.modal-winner-announcement {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.modal-winner-announcement .icon-winner {
    width: 48px;
    height: 48px;
}

.modal-winner-announcement h2.x-win-color {
    color: #FFFFFF;
}

.modal-winner-announcement h2.o-win-color {
    color: #FFFFFF;
}

.modal-winner-announcement h2.tie-color {
    color: var(--clr-silver);
}

#modal-coupon-container {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

#modal-coupon-code {
    font-size: 1.5rem;
    letter-spacing: 0.25rem;
    color: var(--clr-silver);
}

@keyframes winnerFlash {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.05);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* 5. Accessibility 
   Styles to improve usability for keyboard and screen reader users.
*/
[role="gridcell"]:focus-visible {
    outline: 3px solid var(--clr-light-yellow);
    outline-offset: 4px;
}

/* 6. Media Queries 
   Adjustments for smaller screen sizes to ensure responsiveness.
*/
@media (max-width: 375px) {
    .turn-indicator {
        padding: 0.5rem 1rem;
    }

    .score-card p {
        font-size: 0.75rem;
    }

    .score-card .score {
        font-size: 1.25rem;
    }

    .modal-winner-announcement {
        gap: 0.5rem;
    }

    .modal-winner-announcement .icon-winner {
        font-size: 2rem;
    }

    .modal-winner-announcement h2 {
        font-size: 1.5rem;
    }
}